This week I replaced old internal battery pack with custom build battery pack with Samsung ICR18650-26F (2600mAh). Pack is charged without issues and tablet works again as new. All for less than 50$ including work. I suppose that battery must be partially charged before insert to Adam which doesn't support charge battery from zero.
Could you write more about it?
It isn't so much to write.
I opened Adam as was described at forum. So screws out and slowly with credit card flip out front panel. I started on top left corner to bottom. After flip out display is needed detach cables for touch screen and buttons.
Then I detached power cable from motherboard and battery after release 2 screws.
Battery is pack of 3 Sanyo "AA" Lion battery with U profile. Also there is protection circuit including temperature protection (2 sensors on black cables). Charging circuit is on the motherboard.
I don't have equipment for spot-weld so I ordered at battery shop (avacom.cz) build custom battery pack with 3x Samsung 2600 mAh (á 209 CZK ~ 10$) and spot-welded outputs. Works including soldering was for 20$.
Battery pack was already partialy precharged (11,6V between pins B+ and B- on protection board) so I attached to motherboard and tried start Adam. It started without issue. So I reset battery status and plugin power and waited to fully recharge. After a lot of time LED change color from purple/violet to blue and at system was also reported full charge.
I haven't time fully test, but with turn on wifi (download updates) and reading PDFs at public transport (2 hours) after work day (8h) I was on 60% of battery.
I suppose that previously reported problems was due fully discharged battery pack and charging circuit cannot start. At least Openmoko Freerunner has this problem and needed add some capacitors.
any pictures if possible .. ? i am sure it would be a big help for others
Does anyone have a good source for battery replacement?
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