You can get some inexpensive 510 batteries and a 510 charger at ValueVapor. I rarely use mine anymore, but when I did, I'd keep at least five batteries, and got myself the 5 battery charger from totally wicked, to keep them all juiced up and ready to go. If you go to a 510, an on the go personal charging case is a must if you don't want to run out of power on the go. Much as I liked the 510, and its slim sleek look, the quick battery drain was a drag.