Old battery takes 20+ hours to charge. Purchased new battery OEM compatible, also took 20+ hours to charge, but unit won't power on after led light turns green (for full charge)
SOURCE: I have an iPAQ hx2790b - battery does not hold power
try going in to power settings while in the cradle, tap backlight and set it so it doesnt go off. Worked for me!
Testimonial: "Wow - easy as that - thank you - so far so good it seems to be working!"
SOURCE: wont work on battery power, turns off when unplugged
Have you tried Charging with other charger?
In your case it sounds like your Battery is allmost dead. So I'll suggest you to Visit HP site and download Battery testing Software.
With that software you can how if your battery is ok or not. If the software shows you that you need to replace battery then there is no option rather then listening to the software.
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