A couple of years ago I standarized on mag-lite mini-mag lites 2AA for most of my uses & upgraded them with the LED inserts from WallyWorld.
Worked pretty well since the LED's have a longer life & I only had to keep spare AA's on hand.
Camping on Edisto Island (s. of Charleston) over the weekend & used one several times til I noticed that it was putting off a LOT of heat. It was off at the time & in my pocket, but I could feel it getting hotter & hotter. Disected it the next a.m. & found the wires leading to the LED insert fused & the entire insert damaged from heat.
Anyone else had a prob like that or can anyone help solve the mystery of why it went into china syndrome mode?