If you are going to use an ammo box, it is advised to 'vent' the box as they are designed to be air/water tight ... the easiest way to do that is to remove at least part of the rubber seal around the edges of the box ... you do need to leave the rubber seal intact along the front edge of the box (where the clasp is) or it will not secure properly ... I take a lipo bag to the track, and store the batts in lipo bags, in ammo boxes at home ...