I have to agree with Earthling on the iStick 50W and the Kanger Pro Tanks. As you've already experienced, it's not a good idea to have only one set up. When something goes wrong with the only thing you have, you're pretty much SOL. We recommend back ups. Many, many back ups. Or as many as you can afford and then build on those so you're never without should something go wrong. The Eleaf iSick 50W is a solid variable voltage/variable wattage battery with 4400 mAh so it could easily last three days on one charge. They're very rugged and feel good in the hand. The Kanger Pro Tanks have proven themselves to be very dependable with great performance (otherwise they wouldn't have lasted this long). With the right juice, you can create quite a bit of flavor and vapor at a very low price. The replacement coils (don't forget those!), are very inexpensive as well.