Hey I'm using the istick 50 watt. But I honestly want something similar in size that houses 2 18650 batteries that ARE replaceable. I hate running out of battery on the go and not being able to pop in 2 fresh married 18650's. Does anyone know any box that's around $60-100 that can take 2 18650 batteries and is 40-60 watts? Also want built in protection. Doesn't need temp control I don't really drip too much, mainly use sub tanks. But if it does have temp control that's fine too. Looking for good quality that will last a while. I use my mods for a while and don't replace them often. Was thinking about an MVP3 Pro but I don't really want something disposable. Any suggestions would be appreciated, box or anything else with stellar battery life/changeable batteries will be considered. Thanks.