I have loox 718. I bought a usb charger and 2 (two) new accumulators. The worked well when the accumulator was discharged from 100% to more than 20%. However once I forgot to charge the accumulator in time and later when I started to charge it, it did not charged (did nothing when I put into the usb charger) and the pda was not operated anymore. Then I bought the new accumulator and the same happened again and I cannot use now my pda.
I think, thats not a bug, its a feature. I have the same, when I have totaly discharged battery it is impossible to start and charge PDA from USB cable. I think its because charing from USB is controlled by OS and without running OS charge circuit cannt start. Charging from AC Adapter is controled only by hardware circuit, co it can start with OFF PDA