Sooo... I may have blown up my battery.

François-Léonard Gilbert gilbertf at
Sat Dec 12 02:56:50 CET 2009

Mine does not boot up with USB only.   It's a buzz-fixed A6, and  
couldn't start without battery power (AFAIK).   Moreover, the version  
of UBoot I have in NOR dates back to may, 2008, so it is probably very  
stale.   I have so little juice NAND U-Boot won't.

Let's see what I have on hand:
1) a 2500 mAh 4.8v batt
2) proto-board friendly wires
3) a need for a booting phone

If the battery posts of the FR accept 5v from a USB wire without  
damage, could I jury-rig the AA batt's in lieu of the FR battery?   If  
I understood well, the FR needs a lot of mA to boot, but could get by  
on USB after boot.

Has anybody tried this?  Is there some reason I shouldn't?   Is there  
some place where I could see the specs for the power input circuits?


Le 09-12-11 à 11:37, Werner Almesberger a écrit :

> Fran?ois-L?onard Gilbert wrote:
>> 4) try to plug the led + resistor between the FR terminals: very  
>> faint
>> light, but OK
> Great !
>> 5) plug the FR in my computer, put the battery in, power up the NAND
>> boot menu
> Hmm, it should power up on its own when you plug in USB. Didn't
> it do this ? Maybe try the opposite order: insert battery, connect
> USB, then wait and see what happens.
> (I'm assuming you're using u-boot. Things are a bit more complicated
> with Qi, because as far as I know, the low-power path into and inside
> the kernel is still incomplete.)
> - Werner
> _______________________________________________
> support mailing list
> support at

More information about the support mailing list