LiPos are easy really, barely any maintenance needed compared to the old types in my experience. You can buy fire-resistant storage bags which will contain them at least to some extent if the worst happened (which is absurdly unlikely and would generally require deliberate physical abuse of the battery), they also remove the shorting risk being fabric and all. Tbh I give all mine a charge before I put them away, have about 8 packs here and owned most for at least 4-5 years, never had any trouble. For taking to a game I use said 'Fire Safe' bag within my gun bag just as an extra belt and braces
Only time I've had a battery puff up on me personally was actually in my PSP funnily enough. Bought it in 2007, used it loads when I was going through training as I couldn't afford a laptop and we had no internet for the first few months. Put it away some time in 08, got it out when I moved base a few months back (so it'd been totally flat for around 6 years) and the pack had expanded just enough that the bay door wouldn't shut any more. I've personally only ever seen issues in airsoft when they're run too close to empty; or one time when I left my battery with the site staff at a certain place in Norfolk (said staff were utterly shite at running an airsoft game and everything related to it) who somehow managed to make my pack puff right out almost immediately, despite the fact I'd been using it for some time with zero issues using a very basic charger. You'd think someone running the shop at a site would know the day 1 school-boy basics of what sort of juice to put in to a given style of battery.. but apparently not. They didn't give a fuck about my equipment they'd literally just destroyed through their sheer incompetence and then got a sulk on when I left it on their counter to dispose of. Genuine morons.
