On the mini-Maglite spec sheet there's a field for "Power Management" and the answer is "No". What does "Power Management" mean? Does that encompass voltage regulation? If a battery starts at a Lithium primary 1.8 volts all may be okay, just running hot; at a NiMH 1.2 volts you may be close to where the light doesn't have enough volts to operate. Don't know... what does "Power Management" entail.