Misty: those trustfire batteries are very good, you can get them dirt cheap from dealextreme.com, $4 for 2! Once you use them, drain them and charge them a couple times, they work awesome. Get this charger, it charges all sizes and types of batteries. 9 volts, 1.2 niCD and NiMH, 3.7 v LiIon.
DealExtreme: $6.38 Universal Smart Quick Charger - Recharges All Batteries (100~240V AC) If you get it, there's no english instructions., you put the battery in the middle slot, positive end down, and leave it in until the light flashes red/green/red/green.
Nico: See above, the batteries are great, you should be pleased with them.
Survivalism: The ORIGINAL 2 hole 401 made by Smoore is a superior atomizer, but the carts are smaller than 901. I don't mind dripping them to top them up so often. The original ones are getting hard to find, the ones puresmoker carries are 4 hole, and I don't know if they are Smoore products. IF you can't find Smoore, go with Intellicig atomizers.