I tried that technique last night, and while I did wake the battery up, it was not enough to start the phone.
What I did: 1) get 4 1.2v AA batteries in series with a resistor and a LED (for visual confirmation and current limiting) 2) plug the 4.8v in parallel with the FR battery (+ with +, - with -) this lighted up the LED 3) wait 2-3 minutes 4) try to plug the led + resistor between the FR terminals: very faint light, but OK 5) plug the FR in my computer, put the battery in, power up the NAND boot menu 6) cycle the menu items for a few seconds result: the FR shuts down while I cycle the menu. Any suggestions? François Le 09-12-03 à 07:34, Werner Almesberger a écrit : > Al Johnson wrote: >> The only reliable method on my A5 is to jump-start the phone with >> another >> LiIon battery. > > If you've driven your GTA02 battery into cut-off (no voltage between > the terminals), then you can also jump-start the battery by supplying > a bit of energy from an external source, e.g., a battery pack at ~4 V > through a 1 kOhm resistor should do. > > When the protection circuit inside the battery detects the external > power, it exits cut-off mode. This results in a non-zero voltage > (3.something volt) appearing between the battery terminals. > > When the battery comes out of cut-off, you can draw a bit of power > before it enters cut-off again. So you should be able to boot and > proceed with the normal charging process. > > - Werner > > _______________________________________________ > support mailing list > support@lists.openmoko.org > https://lists.openmoko.org/mailman/listinfo/support _______________________________________________ support mailing list support@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/support
