Loss of time when battery dies

I had, what I hope is, a simple question. My iPod Touch is working fine except for when I let it battery die it forgets what time it is. I don't let it sit with a dead battery for to long, but it always needs the time and date reset when I charge it back up.
Is this normal operation? Or is there a backup battery in the iPod that should be keeping the time when this happens?
Thanks for any help.

No, there isn't any backup battery.

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T400 system time resets when battery dies

Anyone else having this issue? I've had it on many of our T400's here. If the user allows the battery to completely run out without shutting the laptop down, it will kill the bios battery too and reset the system date and time.

I have had this problem with other laptops as well..
I am guessing the problem is with the cmos battery on the motherboard and not the main system battery,
Whwn the system is shut down or the main battery dies, the cmos battery is the one that saves the time and keeps it updated.
Also its the cmos battery that powers the bios during system startup.
If you need to reset the time every time you start up the system , thats the first indication that the cmos battery is dying.

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bradchand wrote:
I have a new MacBookPro OSX 10.7.2 from the first day the laptop will wakeup from hibernation or sleep after the battery dies.
I try to let the battery cycle fully before plugging in and reguaarly the laptop shutsdown when the battery is low.
When i try to turn it back on it starts the wake up process with indicator bars showing progress, then it stops at about three bars and just beeps indefinatly until i power off the machine when i turn it back on it comes up but ive lost everything i was working on!
very frustrating, why wont it properly wake up after a low battery hibernation??!????
Well the question is when this happened the first time and you lost everything you were working on why did you let it happen the second time or the third or forth and not plug the computer in.
It may be frustrating but there is only one person to blame and that is you. Not Apple and not the computer. As YOU knew exactly what was going to happen but you let it happen anyway.
The true definition of insanity is doing the same things over and over and expecting a different outcome.

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Sometimes (not often) the light under the trackpad is lit like it is asleep, but it will not wake, I have to hold down the power untill it is off then reboot.
Usually what happens is the battery dies and the computer turns off (no pulsing light), and I loose all my open windows and stuff I havn't saved as if I had manually turned it off.
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It is two years old, but still holds 1872 mAh and the cycle count is only at 278.
I never knew what resetting the PMU was but I read that page and I do it often. When the computer will not boot while plugged in after the battery dies I sometimes try that, but it doesn't help.
Also, quite often, my computer goes back to December 31 1969. But more often than I reset the PMU. Could this mean my PMU is bad?
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Manufacturer: SMP
Device name: ASMB012
Pack Lot Code: 0002
PCB Lot Code: 0000
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Hardware Revision: 0500
Cell Revision: 0200
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Display Sleep Uses Dim: Yes
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Same exact issue on my MacBook Pro. It is brand a brand new model: MacBook Pro (June 2009), with Mac OS X 10.6.1 and "7 hour battery".
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Manufacturer: SMP
Device name: bq20z451
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0003
Hardware Revision: 0003
Cell Revision: 0100
Charge Information:
Charge remaining (mAh): 6515
Fully charged: Yes
Charging: No
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Health Information:
Cycle count: 27
Condition: Normal
Battery Installed: Yes
Amperage (mA): -936
Voltage (mV): 12311
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Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Wake On AC Change: No
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Wake On LAN: No
Display Sleep Uses Dim: Yes
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Disk Sleep Timer (Minutes): 10
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Wake On AC Change: No
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Display Sleep Uses Dim: Yes
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I got an old 2nd gen nano, that is permanently connected in my car.
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Youve got to be kidding me.
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What does that mean when your iPod only charges when you battery dies? (meaning: when my battery isn't dead it wont charge but when the battery is dead thats the only time it will charge)

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Apple Retail Store - Genius Bar

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Device name:          bq20z451
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PCB Lot Code: 0
Firmware Version: 3
Hardware Revision: 2
Cell Revision: 100
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Condition:          Check Battery
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Voltage (mV):          11865
<Re-Titled By Host>

The symptom you describe usually occurs when the battery is disconnected. Since your Battery Hardware display indicates that your battery condition is 'Check Battery", that probably is the culprit. I would think that a new battery should solve the issue. Bring you MBP to an Apple store genius bar.
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I use my 7th gen ipod on bluetooth and when the battery dies while on bluetooth it wont turn on or charge and the computer doesnt find it. This is my 2nd nano in just over a month. The first one had the same problem. how can i fix this?

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Loss of time when battery dies

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