Will a built-in MacBook battery eventually swell?

Hi. I'm using a MacBook as a desktop machine connected to an external monitor. Currently, it's plugged in to the power all the time. I run it off the battery twice a week, to "keep the juices flowing", so to speak.
Previously, I used a MacBook with a removeable battery permanently connected to power. Eventualy the battery died and swelled (as can be expectd), Does anyone know if the same thing happens to built-in batteries? That would force the case from inside.
Tried searching here, and googling. But couldn't find an answer.
Thank you.

Charge and discharge characteristics of Li-polymer are identical to other Li-ion systems and do not require a special charger. Safety issues are also similar in that protection circuits are needed. Gas buildup during charge can cause some Li-polymer in a foil package to swell, and equipment manufacturers must make allowances for expansion. Li-polymer in a foil package may be less durable than Li-ion in the cylindrical package. Li-polymer is not limited to a foil package and can also be made into a cylindrical design. (My emphasis.)
Excerpt. Full text here:http://batteryuniversity.com/learn/article/the_li_polymer_battery_substance_or_h ype

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How long does it take to replace battery in an built-in macbook pro Intel Core 2 Duo 2009? Can I wait for it at the Genius bar or could I do it myself?

My macbook pro shows that I have to replace the battery, but I dont want to leave it at the apple service centre and would like to take it with me after replacement of the battery. Is this a quick action at genius bar? or should I try to replace it myself?
I currently switches off even when it's on normal charger and plugged in. Why would it switch off without the having a battery even when it's connected to via power?

To replace the battery takes about 10-15 minutes. (I have taken it out and put it back in)
However Apple will not sell you the battery, they will insist on installing it themselves. In addition, you do need a #0 Triwing driver to take out the battery. Not an easy tool to find in your local hardware store.
Dutchrob wrote:
I currently switches off even when it's on normal charger and plugged in. Why would it switch off without the having a battery even when it's connected to via power?
Is this the MBP? If so, mention that to the genius bar technician when you have the battery replaced.
Ciao.

My 13.3" macbook pro will not power up.The battery indicator light does not come on.The Mag safe charging light flickers green and red dimly.I had a cell phone connected to the USB port.

My 13.3" macbook pro will not power up.The battery indicator light does not come on.The Mag safe charging light flickers green and red dimly.I had a cell phone connected to the USB port.

This didn't work for me, so I did a bit of searching and TONS of pages later in google, I found an answer. Here are the steps for people who also were in my situation:
1. Take off bottom case
2. Unplug battery - blurry image here: http://i.ytimg.com/vi/03cC79r5Dx4/0.jpg
3. Press and hold power button for 5 seconds
4. Plug a charger in, and it should start booting up
5. After shutting down again, reconnect the battery and close the case up
6. It works! (hopefully, if you guys had the same situation I did)

My macbook battery will not charge. I have tried unplugging and doing an SMC reset but it did not seem to change. I have yet to try another magsafe charger. The charger has a dim green light while plugged into the computer. What are my next steps?

Hello Everyone,
This is my first time using the forum. My macbook battery will not charge. I have tried unplugging and doing an SMC reset but it did not seem to change. I have yet to try another magsafe charger. The charger has a dim green light while plugged into the computer. What should my next steps be, besides trying a new charger as well as being the most cost effective?
Thanks
-TB

Hi ..
The battery may need replacing.
Check the battery maximum cycle count > Mac notebooks: Determining battery cycle count
And check the adapter > Apple Portables: Troubleshooting MagSafe adapters

I am willing to buy a Macbook pro 13 retina notebook, i cant figure out how much battery it has sometime it says that ots up to 7 hours and 9 hours. Which one is it?

Is it 7 or 9 hours of battery life?

Please also keep in mind it does not necessarily mean you will get 9 hours of battery life from typical usage.
You should be getting atleast 5-6 if you are not watching videos and 2-3 if you are watching videos/gaming.
You will only get 9 hours if you are very conservative with your battery which means having only 1 or 2 apps running and not doing any resource intensive tasks.

AASP will not honour Macbook Battery Warranty Extension

I need help in convincing a stubborn AASP in Thailand that Apple has extended the Macbook Battery warranty by two years as per this page:
http://www.apple.com/support/macbook_macbookpro/batteryupdate/
My Macbook was purchased in June 2006 in the USA and is in the affected batch.
I installed the battery update about two months ago, and then started having problems.
First when running the Macbook on battery, it would shut down without warning when the charge got to around 20%.
Then the charge would last only about 90 minutes or so, and battery health was down to 50% at 250 cycles - a symptom described by Apple on their battery update page at;
http://www.apple.com/support/macbook_macbookpro/batteryupdate/
Im now living in Bhutan and the nearest AASP is in Bangkok, Thailand. So I sent the macbook with a friend to Macintosh Center (www.maccenter.co.th) in Bangkok.
They found a problem with the battery and said it need to be replaced. However they said that it would cost Bhat 7,383 (around US$185) to get a new battery as the Macbook's battery warranty is only one year.
According to Apple's Battery Update announcement, my macbook is still under the extended two year warranty. And if the AASP finds that the battery needs to be replaced (which they did), it should be done so free of charge.
We tried telling them about the extension of the Macbook Battery warranty to two years by Apple and sent them the link (via email) and also informed them in person.
However, Macintosh Center keeps insisting the Warranty is only one year.
I tried emailing their service email address and after while
all the other email addresses on their websites. No response at all after three emails.
Help! Any suggestions?
Im getting quite fed up with this macbook. First, the yellow palm rest, then cracking bezel, and then super drive had to be changed twice (These were taken care of while i was in the US).
Some months ago, the same Maccenter also changed a burnt out and fraying power cord and also changed a stuck super drive. But now they seem quite stubborn with the battery warranty.

I am not an applecare customer and they replaced mine. It clearly states the warranty is extended an extra year. Call again and talk to them again. If they don't help ask to speak to their supervisor. If that doesn't work contact
Apple Customer Relations (800) 767-2775
Be polite but firm.

Swollen macbook battery

Checked my macbook battery yesterday and noticed the battery was very swollen. Enough that it made the macbook rock when typing on it.
The model number is A1185
I have been looking for recall/swapout info on these batteries but cannot find anything.
Is there anywhere I can find out if this is something Apple will replace?
Odd thing is the battery work fine. Just a bit scared of it exploding if I leave it plugged in.
Thanks
Paul

Just to clarify... there wasn't actually a recall. They had extended the warranty period for an additional two years. A recall pretty much means you should return your battery... that wasn't really the case.
They are correct in saying that the battery is designed to swell and should not explode. Out of all the reported cases of swelling batteries, I haven't seen any result in a leak or explosion. Of the few leaking or burning battery reports I have seen, they were not attributed to swelling batteries. Now having said that certainly doesn't mean there isn't a problem. That's like having your brakes fail in your car and complaining to the manufacturer about it and them telling you "that's what the air bags are for". Just because it doesn't explode doesn't mean it is working properly. Also, a battery that continues to expand may flex the logic board enough to damage it or cause other functional problems... each of which would be directly related to the faulty battery. Sometimes you really do need to speak with the right person. This particular problem is best dealt with directly at an Apple Store or by calling Apple Customer Relations (which is not the same as the support people you generally talk to). You can reach Apple Customer Relations at:
(800) 767-2775
Give them a call or visit your local Apple Store (if you have one). Let them know how happy you have been with your MacBook except for this one problem which you find worrisome. I would be surprised if they don't get you a new battery.

Macbook Battery Problem

Hi all, this is my first post, but something weird happened to my macbook that I have to share with you.
Ok, my Macbook Core Duo 2.0GHz (1st generation) have had no problem during its first and half year. Then I left the notebook sitting at home for one month as I was away on business. Came back, the machine won't start, used AC adaptor and showed the battery not charging, "x" and everything. My warranty expired, so I bought a new battery. Once I got that, it worked fine for almost 7 months.
Another business trip left my macbook for 1 month, I came back, the battery is dead again!!! So I went to apple support and bought another new battery. This time I installed it at home, and it doesn't charge what-so-ever. I tried everything from SMU reset, PMU reset, P-RAM reset. NOTHING WORKED.
So I took a friend's macbook battery to try, and it worked! I can charge that battery with my macbook, and my battery won't charge on his macbook. So scientifically I thought its the battery defect. I went to Apple Care and they say they will replace it for me, but think that it should be my macbook's problem. Must be the Logic Board, I explained why I disagree, and that the battery came with only one LED blinking when I got home to charge, the current was already too low to charge.
Anyways, I was able to buy a second-hand battery really cheap but with limited life-span and use it until my replacement battery returns. Everything seem fine and I can charge it up to 100% although it will only last me 50-mins, still not bad, right?
I was reluctant to completely drain this battery now since I am afraid it will drop to zero and won't recharge like the other ones.
I am using Boot Camp, and Vista as well as OS X. Suddenly today, two days after I bought the 2nd hand battery, I was using Vista to show my friend the battery problem is fixed. But suddenly out of nowhere the battery dropped from 95% charged to 0% in seconds. It shuts down automatically, and the battery was flashing one LED indicating it's dying.
I started back in Mac OS X and found the charger able to recharge, but it fixed at 0% for 20 minutes. I thought I am screwed and went out for a smoke. I came back to see the battery charging back to 5% and then slowly to 10%, and 20%, suddenly it went back to 85% in seconds, and then 100%. I try to unplug it and it seemed fine. I left it on without the adapter for 20 minutes, the battery drain normally, to 70% (it's fine considering the battery was 2nd hand) My friend thought I should try to switch back to Vista to see if the same thing will occur. So I did, and before the Vista screen came up, the macbook blacked out. I checked the battery indicator and it's flashing one LED again!!!
So I switched back to Mac side and re-do the charging, this time it took longer to get back to +90%, I thought this is normal, 'cause I did use the battery longer on the Mac side before switching to Vista for the test.
I thought to myself, why Vista drained my battery, and then I remember the first battery that died on me was about the time I switched the PC side to Vista. Prior to that, the PC side was using XP. The second time it died it was in Vista as well. I also remember I wanted to reduce the size of my PC partition, so I trimmed off unnecessary features like hibernation by (Powercfg -h off). It saved 2G in size but it may be causing some problem to the charging circuit for the Mac-hardware??? Don't know for sure.
So I erased my Vista partition, and re-installed XP. Since then I tried both sides without adaptor, usually for 10-minutes or less, and no sudden dropped to 0% occurred since.
Everything else is working fine with my macbook, except the power features. Right now at least I can charge the battery, but I am always worried about when or IF the battery will dropped off and kill itself.
I am waiting for the replacement battery to return from APPLE, and hopefully when it returns, my Macbook will be able to recognize the DEFAULT low-charge of a new battery. I'm still not sure if my macbook is defective, and if it did killed the first battery replacement they gave me a few days ago. If it did kill a decent battery, will it kill this new replacement as well??
I know for a fact that the reason why the machine won't charge the battery is because the current of the battery has become too low for the machine to be able to charge it. If the current becomes lower, the "X" will occur suggesting that the machine doesn't even recognize it's a battery. But what I want to know is what caused the battery to drop to such a low current if I turned off the macbook during storage.
Sorry for the length of this post, but I have to be clear on all the details if I want help, I suppose. Right now my question is (1) Why is this occuring?? (2) Am I right in assuming that by removing Vista with XP, the problem will not repeat?? (3) Is it likely for any new or 2nd hand functioning battery to drop to the state of the other battery any time soon?? (4) Am I doing proper care for my Macbook, and what should I do in the future to avoid the same problem from occuring??

gpotts,
Thanks again, here's my battery profile: (keep in mind this is the 2nd hand battery I am profiling) BTW, something happened when I was doing this message, I left the notebook on for about 20 minutes, it dropped from +90% to 48%, macbook prompted me that the battery is running low. I plugged the adaptor and it went back to +95% within minutes...
Good thing is, I haven't seen the sudden drop to 0% ever since I removed Vista, and also I am able to charge my battery everytime I try now, no more "NOT CHARGING" or "X" indication.
Any clues??? Thanks in advance.
Battery Information:
Model Information:
Serial Number: DP-ASMB013-34cf-** <Edited by Moderator>
Manufacturer: DP
Device name: ASMB013
Pack Lot Code: 0001
PCB Lot Code: 0000
Firmware Version: 0102
Hardware Revision: 0300
Cell Revision: 0100
Charge Information:
Charge remaining (mAh): 1533
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 1597
Health Information:
Cycle count: 349
Condition: Good
Battery Installed: Yes
Amperage (mA): 466
Voltage (mV): 12597
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 60
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 60
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 2
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
Charging: Yes

Brand new macbook battery won't charge

Hello!
I bought a new battery for My Macbook Pro 15 Early 2011 (unibody)
The controller sees the battery, it discharges when power supply disconnected, but it does not charge when MagicSafe is plug in.
Green light is always green, controller dont swithch to charge battary.
How to fix it?
I am already tried:
— Disconnect and reconnect battery
— Hold on button for 5 seconds when the battery and power supply disconnected
— Make SMC reset
— Make PRAM и NVRAM reset
The battery bought in the official service center in Bangkok. Now I left Thailand and can not change battery.
Here are the details about battery
Battery Information:
Model Information:
Serial Number:          D8*********LAQ
Manufacturer:          SMP
Device Name:          bq20z451
Pack Lot Code:          0
PCB Lot Code:          0
Firmware Version:          406
Hardware Revision:          2
Cell Revision:          158
Charge Information:
Charge Remaining (mAh):          2685
Fully Charged:          No
Charging:          No
Full Charge Capacity (mAh):          6953
Health Information:
Cycle Count:          0
Condition:          Normal
Battery Installed:          Yes
Amperage (mA):          0
Voltage (mV):          11364
System Power Settings:
AC Power:
System Sleep Timer (Minutes):          10
Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          10
Wake on AC Change:          No
Wake on Clamshell Open:          Yes
Wake on LAN:          Yes
Current Power Source:          Yes
Display Sleep Uses Dim:          Yes
GPUSwitch:          2
PrioritizeNetworkReachabilityOverSleep:          0
Standby Delay:          4200
Standby Enabled:          0
Battery Power:
System Sleep Timer (Minutes):          10
Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          2
Wake on AC Change:          No
Wake on Clamshell Open:          Yes
Display Sleep Uses Dim:          Yes
GPUSwitch:          2
Reduce Brightness:          Yes
Standby Delay:          4200
Standby Enabled:          0
Hardware Configuration:
UPS Installed:          No
AC Charger Information:
Connected:          Yes
ID:          0x0100
Wattage (W):          85
Revision:          0x0000
Family:          0x0085
Serial Number:
Charging:          No
<Edited by Host>

That makes things difficult.   You can use your MBP as a 'desktop' with it connected with the power adapter but the performance will be degraded when the battery is totally discharged. The only other option that I can think of is shipping it to an Apple repair location.
Ciao.

Can anyone recommend a USB CF card reader that will work in my Macbook Pro Retina? My USB card readers for CF cards do not work

At present, the only way I can load photos from a CF card to my new Macbook Pro Retina is by loading them onto an external hard drive via an old PC that can accept either of my USB card readers, then plugging the external hard drive into my MBP. Neither the USB card reader or the cable that comes with the Canon HDSLR camera will transfer photos directly to my MBP. I find it unbelievable that I have to go to a PC to load photos because I can't do it with my new MBP.
Has anyone found a reliable USB CF card reader, or one that connects via thunderbolt or HDMI, at any price, that will work directly with the new MBP Retina?

This is what we need:
Location photoshoot - we use the Canon EOS 5D Mk II still camera & the Canon FX100 pro camcorder.
CF cards are: SanDisk Extreme UDMA & SanDisk Extreme Pro UDMA 6 for video (I think they are both Type II) My Mac recognises them both as FAT 32 format
My MBPRetina is on the latest version of Mountain Lion OSX 10.83
the files from the camcorder will transfer to my MacBook Pro Retina directly via the camera's cable but it is quite slow & it means I cannot continue to film while downloading files but this we can live with.
the files from the still camera Canon EOS 5D Mk II will not transfer directly via the camera's cable - have yet to get the Canon software to download, but via the camera's cable will not help anyway as we need to have the still camera free to keep shooting.
We need to be able to take out the CF card from the first part of the shoot & download the still shots while just on the Macbook's battery power, while we insert a fresh CF card back into the still camera to continue with the next part of the shoot simultaneously (while the first card is downloading.)
The files from the first part of the shoot will be both in RAW (.CR2) & Jpeg format. We just need to quickly transfer the jpegs, then I do a quick sort, batch the best ones as black/white images, & use these in a client slideshow immediately after part 2 of the shoot.
Obviously we need fast data transfer speeds, & rely on the MBP's battery power while on a location shoot.
The card readers I have tried are an older specific CF card reader branded as Palm, & a USB 2 multi card reader branded as Travel Flash. With both readers, the lights on the readers flash on & off, & the MBP recognises the card & the files will even appear both in Finder & in i-Photo, so it starts importing, then aborts with an error message saying:
'The Finder can’t complete the operation because some data in “” can’t be read or written.
(Error code -36)'
& another message saying:
'the disk was not ejected properly'.
So it appears the MBP does read the CF cards but the card readers don't stay connected, no matter what angle I put them on or however many times I re-connect them.
Yes, they are probably cheap & I want to buy a decent one.
So, in summary:
the card reader needs to work when the MBPR is only on battery power (I read in some forums that some USB card readers aren't so reliable on the laptop's battery power)
the card reader needs to be quite fast. I have read the USB 3 readers won't read CF cards at higher than USB 2 speeds. Is this true? Are the firewire connected ones faster, & if so, are they still reliable on the MBP's battery power?
From research, it appears my problem is associated with my specific model of Mac & platform, being MacBook Retina on Mountain Lion OSX Version 10.83. If any of the recommended card readers have been successful with this, plese let me know.
Thanks heaps for the suggestions so far.

Macbooks battery

Hello,
I have a problem. Yesterday I tried to start up my macbook and it didn't work without a power adaptor. It appeared a black X in menu bar and said "no batteries available" One indicator on the battery is still shining green,no blinking. still shining, even if i put the battery out of computer. The power adaptor is still shining green. the day before everything was ok, normal. I would like to ask about the problems Apple presented about the batteries in Macbooks and Macbooks Pro. They said, only Macbook and Macbooks Pro purchased until April 2007 could have not well working batteries. Are these batteries recognized in any other way? Serial numbers or anything? Because I bought my Mac in August 2007 and it could be, that this Mac laid in the shop for example from March..but I can't ask for new battery for free, because I bought it in August. I don't think it is ok. Many Apple new products come to Europe later, so it could be Macbook with this wrong battery. Please tell me what to do. My Mac is only one year old. Thank you. Sazcat
Message was edited by: sazcat

Yeah I have the same issue. Spent the last week going back and forth to Apple support & customer relations trying to get them to accept that it is unjust that batteries die after just a year and a half. Perhaps it's a conspiracy: that their warranty only lasts a year... anyway, long story short, even though my Macbook was bought between February 2006 and April 2007 and displays two of the four problems named in its qualifying for extended 2 year warranty, they told me my serial number didn't fit.
Ref: http://www.apple.com/uk/support/macbook_macbookpro/batteryupdate/
No where does it say on their info page about serial numbers. It does however say "This program extends repair coverage on the battery for up to two years from the date of purchase of the computer for Intel Core Duo-based MacBook and MacBook Pro computers. Apple will continue to evaluate the battery update program and will provide further extensions as needed."
So come on Apple, re-evaluate and provide further extensions. You. Are. Ripping. Off. Customers. Here!!!

Do I need to run my Macbook battery flat?

Will I prolong the life of my Macbook battery if I occasionally allow it to run flat?

Running it flat doesn't do anything special, but as Mort mentions Apple recommends that you calibrate your battery every few months as shown HERE.
Calibrating your battery really means calibrating the battery meter. It just resets the meter so that it gives a better estimate of the charge remaining.

Macbook battery won't charge suddenly

I'm having a problem with my macbook battery.
My mac won't seem to charge for some reason. Earlier today my mac showed an "X" in the battery on the menu bar. It wouldn't charge and the magsafe didn't light any color. I thought the charger that was broken, but i did an SMC reset and then the magsafe lit up green for a while and the percentage of battery life was shown on the menu bar again. But now the magsafe is not lit up any color and the mac is not charging eventhough it it plugged in. Any idea on what to do?
Model Information:
   Serial Number: W0037TPMVE1KB
   Manufacturer: SMP
   Unit Name: bq20z451
   Pack Lot Code: 0000
   PCB Lot Code: 0000
   Firmware Version: 0201
   Hardware Revision: 000A
   Cells Vision: 0164
   Information about the level of charge:
   Residual current (mAh): 4103
   Fully charged: No
   Charger: Yes
   Full charge capacity (mAh): 4971
   Information about the state:
   Cycle Number: 428
   Condition: Normal
   Battery installed: Yes
   Amperes (mA): -591
   Volts (mV): 11914

Welcome to Apple Support Communities
OS X is telling you that the battery has to be replaced as it's damaged.
If you have an Early 2008 or older MacBook Pro, you can buy the battery and install it yourself > http://store.apple.com/us/go/product/MA348LL/A
If you have a Late 2008 or newer MacBook Pro, take it to an Apple Store or reseller to get it replaced. You can also replace it yourself, but you will void the warranty if it's in warranty and the cost difference is small

Apple wont replace MacBook battery

Hi
I have a Macbook core duo. I bought it in November 2006, so it is about 18 months old. I have the extended AppleCare warranty on it.
Using coconut battery, my MacBook's battery has 188 charge cycles with 1823mah capacity left, or 32% capacity.
I was just at an Apple store where the genius said that this is normal and it is not defective as there is no "x" in the battery bar. So, Apple will not replace it.
I have an iBook from 2003 with 348 load cycles that still has 72% capacity, so I think that the macbook battery is defective, as it only lasts for 45 minutes now.
Should Apple replace the battery? How can I prove to the genius that it should be replaced?
Thanks!

Hi, and welcome to Apple Discussions.
First, try resetting the SMC:
http://docs.info.apple.com/article.html?artnum=303319
If you call in, they will have you try resetting the SMC first (at least, they had me do that).
See if that improves the battery's performance. That did double my battery time from 46 minutes to an hour and 27 minutes. However, my battery only had about 160 cycles on it, and an hour and 27 minutes seemed too little to me, so I called back. They shipped me a new battery.
Good luck.

Will RAM upgrade on Macbook Air result in a bottleneck?

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Will RAM upgrade on Macbook Air result in a bottleneck?
Hi I am planning to buy a Macbook Air with the base configuration, but was giving the RAM some thought. I was thinking of upgrading it from 4 GB 1600 MHz LPDDR3 SDRAM to 8 GB. With the student discount the upgrade will cost me an additional $90. I will be going to uni for life sci and will be be using it for work assignments, music, and maybe some small-time gaming. I currently don't really game much but maybe sometime in the future I may decide to play games such as LoL or Warcraft maybe? What I was wondering was that is it actually necessary to upgrade the RAM to be able to play these types of games without lag? I am fine with a little bit of low fps, as long as it isn't to noticable and stil fairly smooth. Maybe with like safari with music and a word processor and the game open, would the MBA be able to handle it effectively? Also, would the RAM upgrade be ineffective because of a "bottleneck" where the other specs limit the effectiveness of the increase in RAM? The rest of the specs are: 1.4 GHz dual-core Intel i5, Turbo Boost upto 2.7 GHz Intel HD Graphics 5000 128 GB PCle-based flash storage So overall, is it worth it? Will it make gaming significantly better, and more importantly, will 4 GB just be enough too? Thank you very much for reading that very long question! All answers will be appreciated!

Did you get a reply on that site?
Are you comparing 11-inch/13-inch MacBook/Air to 13"-15" MB/Pro?
A better idea would be to get the MacBook/Pro, since it has a better
processor and a higher RAM spec capacity, when or if upgraded.
More RAM will not be a bottleneck; a slow CPU processor & too much
demand could. Including video demand, and gaming is unlikely, too.
Check the specs at the Apple Store to compare MB/Pro w/ MB/Air;
even the basic MacBook Pro 13-inch without Retina has a fair CPU
and OK specs for most things; and you may be able to still upgrade
the RAM in that basic model (also has optical drive built-in) yourself.
See everymac.com and mactracker.ca for sources of specifications.
Good luck & happy computing!

Will a built-in MacBook battery eventually swell?

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