Whatever you do, don't use a non-Newton AC adapter with a 2000/2100/eMate. You will be asking for a HUGE problem.
Your best bet is to use NiMH AA batteries in the AA battery tray if you don't have the battery pack for the 2000/2100. Charge them in an external charger. I can't remember if the lithium AA caused any problems other than the expense
Your best bet is to use NiMH AA batteries in the AA battery tray if you don't have the battery pack for the 2000/2100. Charge them in an external charger. I can't remember if the lithium AA caused any problems other than the expense