The new Mini Unitank from Kanger - fill it from the top!
New design spring loaded system allows the top cap to be unscrewed and filled from the top without leakage.
Got one of these to play with - and have to say was a 'Joy' to use when out for a few drinks - not having to over-complicate things by unscrewing the miser (and potentially accidentally unscrew the tank and dump its juice) from the device and just take off the top and fill - was a much more relaxing evening of Drinkies
Was using it on a 'Fatboy' Spinner at 3.8v's all night too
Looking forward to trying a micro-coil in one next