I have a Linksys 811b card that is working on my IPAQ 3670. I also have the single slot extender sleeve (battery won't charge) and the double slot extender sleeve (battery won't charge) but with a/c plugged in they both work for cf memory and wireless. I just installed a new battery on the IPAQ itself and now must find batterys for the extenders. Question: Can you use the same battery on the extenders that I used on the 3670?