04-03-2008 12:29 PM
HP iPAQ's typically include an internal backup battery that allows the user to change the main battery without losing RAM data (user-installed programs and data) as long as it is replaced within a few minutes.
The amount of time the backup battery holds power varies between models. Some HP iPAQ backup batteries provide power for not more than 3 or 4 minutes, others last up to 30.
If the main battery is removed from the unit for longer than the backup battery provides power, the user will lose unsaved RAM data.
If after charging the iPAQ for more than 3 hours, the backup battery remains empty then we suggest that you send the iPAQ for repair and get the backup battery of the iPAQ replaced.
Also, note that there are 2 batteries. One is the Main battery that you can remove and the other is the non removable backup battery. The backup battery will provide charge if the Main battery lose charge. But you will not be able to work with only Backup battery. The backup battery can only supply charge for a maximum of 20 minutes. You will need to charge the Main battery before that.
Backup will not be charged separately. It is associated with Main battery.
The backup battery is not a user replaceable part.
05-22-2010 07:35 AM
05-22-2010 08:27 AM
There are places on the web that will replace your battery for you. One such service you could check out is Pocket PC Techs.
Also, if you feel up to trying this yourself, you might find this article useful.
I have an old IPAQ whose backup battery no longer works. I don't replace the main battery and if I ever have the need to remove the main battery, I'll just use IPAQ Backup to backup the entire IPAQ to my storage card. Then I can easily restore from the storage card and not have to "rebuild" the device. That works for me, so I've decided not to replace the backup battery.
05-23-2010 07:20 PM
replacing the hx4700 is very easy
have a look at below video and photos
05-24-2010 01:29 PM
06-02-2010 08:33 AM
backup battery for ipaq hx4700 this is a special one .Probably world's smallest ni-mh rechargeable battery manufactured by Varta. Possibly can not be found at retailers.
you may try to purchase at