CMOS battery replacement

Andrew Schenck andrew at
Fri Dec 11 23:38:54 UTC 2015

That's a lot more work than I had hoped.  Thanks very much for the info 
though.  If I'm going to be soldering I might as well try to fix the USB 
port and GPS port at the same time.


On 12/11/2015 1:30 PM, Benjamin Deering wrote:
> The backup battery (supercap?) is welded to its bracket and
> won't push out.
> I replaced the backup batteries in my GTA02s with supercaps several
> years ago.
> The parts I used didn't match the original footprint so it was a little
> work.  If you get the exact replacement part, it would be easy if you
> have soldering experience.
> I vaguely remember a software problem causing the line that charges the
> backup bat/cap not being set high.
> Good luck,
> Ben
> On Fri, 11 Dec 2015 12:26:54 -0800
> Andrew Schenck <andrew at> wrote:
>> The secondhand GTA04 I have now is pretty beat up and can't charge
>> because the USB port is disconnected.  I've been using a spare GTA02
>> as a charger, but every time I switch out batteries the clock resets
>> to 12/12/1999 16:00 and it's a pain to re-set it since network time
>> doesn't work.  I couldn't find any information on the wiki about
>> replacing the CMOS battery to solve this problem; has anyone here
>> dealt with this same problem before and have recommendations?
>> I disassembled a GTA02 enough to see the battery, but it didn't yield
>> to gentle pressure trying to slide out of its bracket and I don't
>> want to destroy things too badly in my attempt to fix them so I
>> didn't push too hard.  Because of this, I don't even know the exact
>> type of button cell to buy to replace it.  Any help would be
>> appreciated.
>> Thanks,
>> -Andrew
>> _______________________________________________
>> Openmoko community mailing list
>> community at
> _______________________________________________
> Openmoko community mailing list
> community at

More information about the community mailing list