Why would the canister pressurise?
The light worked fine, no signs of a problem or overheating of the battery. Canister was dry - no leaks?
The torch is a Diveright slimline canister, 12v, 4.5Ah NiMH to a converted XML head?
The toggel boot was blown up like a balloon, & canister hissed when I undid latches.
I could understand it if there was a short - but there did not appear to be?
The battery was flooded many months ago - but it has worked fine since (100 times)