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Posted by M.I.5¾ on November 14, 2007, 4:01 am
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>I just recently had to deal with the inconvenience of a worn out
> backup battery in my HP iPAQ HX4700 PDA. Every time I would swap the
> main battery back out for my 2nd one on a long plane flight, I'd have
> to go through the hard reset process, initial setup, and backup file
> restore.
>
> I took pictures of the process and wrote up a quick guide to help any
> of you who want to replace the backup cell in your iPAQ.
>
> Here's the guide -
>
http://paulstravelpictures.com/HP-iPAQ-HX4700-PDA-Backup-Battery-Replacement-Guide/index.html
>
> I hope some of you find it useful. My PDA is now healthy again. :)
>
The glaring error in the guide is in these two paragraphs:
"What I didn't know then was that changing the main battery with both the SD
and CF card still in the PDA was severely straining the tiny rechargeable
NiMH backup battery inside the HX4700.
"The small 1.2 Volt 6 mAh Ni-MH Varta V6 HR button cell backup battery was
only designed to maintain the iPAQ's main internal built-in memory during
loss of primary battery power, and not also the expansion Secure Digital and
Compact Flash cards."
The error is that the backup battery does *not* supply any power at all to
either the SD or CF cards as these are based on FLASH technology that
requires no power to maintian their contents. Further, the backup battery
will (or should) maintain the contents of the internal RAM for considerably
longer than the time required to change the main battery and is not in fact
under any strain at all.
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