I also have been using Ni-MH in my MagLEDs, with no problems whatsoever.
Unlike the 2AA MagLED, which just blinks out when the batteries are low, the 3AA MagLED is a real battery squeezer.
It will just get dimmer and dimmer, never blinking out.
I tried to drain 3 AA alkalines, and there was still enough light to read by, even though each cells voltage was down to 0.975v each. Don't drain your rechargeables this low, it could damage them...:green: