As others have said, really depends on how you plan to use the scanner. If you are going to use it on your desk or in your vehicle then the 996 may be your best choice with the appropriate home or vehicle antenna. If you like the advantage of having it portable and not a lot of hassles then the 325 would be a better choice. I have preferred a handheld since I can just grab it and go, can use it anywhere. As for the battery situation, the 325 using two AA's and you'll get about 6-10hrs on a set of fully charged batteries depending on how much your using the back light and so on. You can buy q 4 pack of AA rechargeable batteries using 2 in the scanner and 2 charging in a stand alone charger always giving you a fresh spare set. When in the vehicle you can use the USB programming cable as a power source (wont charge while you are using the scanner), and plug into your vehicles USB outlet or the adapter than plugs into your 12v socket which will run off your vehicles battery and not your AA's. For extra power, you can buy the portable power packs pretty cheap now, and keep a couple of them charged for when you going to be out for extended times, use the USB cable to plug into the power pack and power the scanner. Extra AA batteries and a couple of power packs wont be that expensive and can keep your scanner powered for days when you don't have the ability to run off of home or vehicle power.
Just all depends on how you want to use the scanner, for portability i'd go with the 325, for a dedicated use (desk or vehicle) then I'd go with the 996.