Quote:
Originally Posted by Frogm4n
Several mobile devices switch to battery power for a moment while powering on. If the battery is dead then when they do that they just power right back off. I've seen it happen on older Android devices, which share the same/similar chipsets as used in Kindles. If you were comfortable working with the electronics you could remove the battery and clip wires from a bench powersupply set to the right voltage to the terminals on the board. That would let it run as if it was on battery power and at least confirm general good working condition.
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Not on some models that use thermistor and on no models using serial data. The PSU should be about 3.9V to 4.1V to avoid damage (if one cell), then either it works or not. You can't use 5V at the actual battery connections and any attempt to charge the cell directly can result in a fire or small explosion.
A PSU is mostly likely to work on a model with only two connections for the LiPoly cell that has its own controller. The USB connection then can't be used because the PSU won't accept a charging current. If you need to also use USB, then the PSU also needs a dummy load similar to load a charging cell might be. An 8.2 Ohm 3W resistor might do for an ereader that charges at 0.5A (500mA) max.