If you dont mind bulkyness and dont want to order parts, all you need to do is head by your local radio shack and pick up a 4xaa box, 4x (or 8x) AA rechageables and charger. You can use 3x AA to get 3.7-4.2v. Just need to drill a hole into the top (farthest from the built in switch) AA spot so you atomizer can connect there. Make the hole just big enough so the battery connector (scavenged from dead battery) can be pressed in. If you want you can slather the whole backside of the connector in epoxy to hold it in place since its sealed. Just use the lead running from the switch to a momentary switch (also found at radio shack) and solder on a lead from the metal plate the last battery touches to the battery connector. You can make this mod for 5-10bux depending on what you have on hand. Search around the forums for "juicybox". However the nico stick is smaller and all you need to do is order some 3.7v lithiums online. The 3x AA mod can last upwards of 3-5 days depending on how much you vape, personally I vape more than I breathe air some days.