If its only lasting 4 hours, they are building them wrong. The mods I make last up to 3 days on 2x14500's. And leaking? Means there is too many ways for air to enter/escape. I make sure connectors are completely sealed. Odds are that you got a mod with a bad regulator and its probably pushing 6-8V through... 7V+ will pop an atty almost immediately in my experience.
If you cant get it working, and are tired of dealing with the supplier, send it to me and I'll fix it for free. (You gotta pay shipping both ways)
BoxModMan got a reaction from Brian in 5V Boxmod Troubles