Question about HP iPAQ H4150 Pocket PC

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The backup battery not working

The backup battery is not working it allway fully charge but if i take out the main battery it looes all it memory. can the backup battery be replaced.
any help with this matter would help.

thanks

Paul

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  • Used2Batech Mar 10, 2008

    I have recently acquired a used HP Ipaq4150. The backup battery appears to be completely dead as it is showing 0% despite sitting in it's cradle for over 6 hours. I have read your blog about replacing the backup battery however I'm not sure where to find a replacement and the hardware screws do not seem to be standard phillips head screws. Suggestions?

  • pa1gl Aug 06, 2008

    I am having the same problem with already my second 4150, is this a problem of the backup battery it self , if so, how to replace it without damaging the 4150 ? if not what can be the problem, the battery looks full.

    BR Gerad

  • tjaxbr Mar 31, 2009

    do you know the battery voltage ?because I have the same problem and, I need to know it to replace for a new one.

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  • 198 Answers

Hello Paul,

Yes the battery can be replaced but this will require you to dissasemble the pda. The problem you face is a clear sign that this battery has failed. There has always been a problem with hp's battery measurement algorithm regarding that secondary backup battery. Altrough it is empty or even if you remove it, the program will still display a full bar. In order to change this battery you will need to remove the screws from the back of your unit. The casing will come off pretty easy. The back-up cell is a small coin like battery most probably wrapped in a green plastic shel. you should find a similar battery and connect the pins from the old one to the new. The battery size is not critical as long as you can make it to fit in the space inside. Try, however, not to use a very small battery because it will drain much faster then larger ones. Carefull when observing polarity.
If you need more informations please reply.
Bogdan.

Posted on Feb 09, 2008

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