i have a ntc3,i would recommend getting the rechargable 5cell 6volt pack,you can zip tie it in,then just unplug it when its time for charging,with out removing the wihole pack.you can get the 6 volt packs off ebay for under $15,make sure you get ni-mh and a charger.i paid $8 for my charger at my LHS.so for $23 i never have to buy batterys and never have to worry about the thing falling out.