I would like to get a second battery but was concerned that the extended battery might be a bulkier battery - doest it alter the total size of the iPaq or does it manage to fit in the same space?
Yes, the 4350 (or 4355 if you like) battery is slightly longer but about the same width and length as the 4150's. But if you want an extra 2-3 hours of battery life...well, once you experience it you'll never go back to anything less.