I bought the wrong cardbus for my laptop. Needed an "expresscard" also for some reason got the wrong battery pack for my camcorder. B&H doesn't offer returns on batteries and the other company won't take it back since I've opened the box.
So if you need a 3-Port Firewire IEEE 1394 Cardbus or a JVC BN-V428U Battery then go and save some green:
http://search.ebay.com/_W0QQfgtpZ1QQ...QQsassZhilldev