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Originally Posted by wzielenski
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Hi Steelhand, and welcome to the forums. I don't know how it's 'designed' to work, but my experience has been that the main battery in the ipaq draws from the expansion battery. My expansion pack battery always loses power before my main battery.
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The issue of how the batteries work with the expansion pack is confusing.
Firstly, if you have anything at all in the expansion slot, the battery in the expansion pack is used to power it, and does not really increase the useful charge of your iPAQ. This is even true if you have just a memory card in there.
If you do not have anything in the slot, the external battery will trickle charge the primary battery in your iPAQ.
Secondly, you must have a primary battery in your unit that is charged. You cannot use the iPAQ with no battery in it with just the expansion pack and a battery. Your unit will not work directly off of the expansion unit battery ....
it only serves to trickle chare your main battery if there is nothing in the expansion slot
As another issue I have found that most of the aftermarket expansion sleeve batteries do not work as well as the original HP/Compaq batteries. When you charge them they will indicate 100% charge .... BUT-if you have nothing in your slot, which means that you are trickle charging your primary battery, the charge drops down to about 80% within minutes. I have played around with this with both HP batteries and aftermarket, and think that there is a chip or something in the original batteries that control the charging. The big problem is that to my knowledge there are no more original batteries sold. The use of aftermarket batteries is not a problem other than the fact that you do not get as long a charge with them, regardless of what they claim the capacity is.
You can always check the amount of charge in your external battery by going to START> SYSTEM> Expansion Pack.
Len
