Differences in the handling of battery technologies

Comparison	NiCd	NiMH	Li-Ion
Self-discharge per month	20%	25%	3-5%
Classic memory effect	Yes	No	No
Lazy battery effect	Yes	Yes	No
Ability to function at frost temperatures	At -18 °C, still 40% capacity = still functional	At -15 °C, 0% capacity = no longer functional	At -20 °C, still 50% capacity = functional
Storage at frost temperatures	to -20 °C without damage	to -20 °C without damage	to -20 °C without damage
Storage time without recharging, used battery	up to 6 months	up to 6 months	up to 24 months
Optimum storage temperature	5-15 °C	5-15 °C	5-15 °C
Battery protection ECP	No	No	Yes