Originally Posted by
seeker333
True. Nimh will quit working when it get below freezing.
Plus the LI weighs much less. But you pay a premium for these benefits.
NiMH, Li-ion and SLA all have about the same temperature threshold... about -4F...NiCd will continue to operate down to -40F. Don't try to charge any of the batteries when they are cold. Let them warm (or cool) to room temp before putting them on the charger.