RTC battery problem A215-S7437

Hi all,
I have been having problems with my Satellite A215-S7437 laptop getting a "CMOS checksum bad" error upon startup for the past couple of months. This error usually occurs the first time I start the computer up in the morning. I press F1 to load defaults and windows starts as normal. No bigs. I tried to charge the RTC battery by leaving the computer plugged in (charging) and on for 24 hours. This didn't seem to help. I also recently updated the BIOS to the latest version. This hasn't helped either.
In addition, sometimes, especially when I haven't turned the computer on for a while, it will fail to boot. No splash screen, just lights and normal HD powering up sound but nothing else. I power-cycle the machine about 10 times and eventually it will start, give me two system beeps and the checksum bad error. I hit F1 to load defaults and Windows starts normally. Today I got a new error "ERROR 0250: System battery is dead - replace and run SETUP. ERROR 02B0: Diskette drive A error. Press F1 to load defaults, F2 to setup." The machine did not respond when I pressed F1 or F2, so I power-cycled it and got my familiar CMOS checksum bad error and it started as usual.
All this to say that I am convinced that my RTC battery is well and truly the cause of my problems and should be replaced. Now, the question is whether or not it can be done without sending my ~3-year-old laptop to a ASP 3 hours away and paying an arm and a leg. I do have a kind friend who I am confident can perform laptop surgery to replace the RTC battery without killing it.
Does anyone know what kind of RTC battery this model takes? Is it soldered to the motherboard? How much would it cost to have the ASP take care of it?
Thanks for all your help.
Regards,
T

Hello
Googling around I found info that for Satellite A210 (similar to your US A215) you can use follow RTC batteries:
RTC battery (Maxell ML1220T10) Lithium-Ion 3.0V 14 mAH
RTC battery (Maxell ML1220HT10) Lithium-Ion 3.0V 18 mAH
RTC battery (Sanyo ML1220T28) Lithium-Ion 3.0V 15 mAH
RTC battery (Panasonic ML1220/B) Lithium-Ion 3.0V 17 mA
Replacement procedure is pretty complicated and the whole notebook must be disassembled. If you are not familiar with this stuff you should not do this to avoid some hardware damage.
I dont know how much you must pay for replacement by ASP. Call and ask them.
Bye

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Why you want to replace this
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