I get a similar problem with a 910.
Does not charge from car unit or base station despite green LED being lit, when powered up I get warning the battery is flat so for some reason the power gets to the LED but not the rest of the circuitry?
Just incase I replaced the battery but the same symptoms persist.
Any ideas? perhaps a voltage regulator chip has gone open? but how to identify and replace this if that is what it is?
Graham, March 2010