Charging Nickel-based Batteries Simple Guidelines

 Simple Guidelines on Charging Nickel-based Batteries

    Consumer chargers do not always terminate the charge correctly. Remove the batteries when perceived full.
    
    Do not charge at high or freezing temperatures. Room temperature is best. Read more about Charging at High and Low Temperatures.
    

    Do not use chargers that cook batteries. If no alternative exists, charge under supervision and remove the battery when warm to the touch.
    
    Nickel-based batteries are best fast charged; a lingering slow charge causes memory.
    
    Below 70 percent, the charge efficiency of an industrial NiMH is close to 100 percent; the battery the pack remains cool.
    
    Not all NiMH can be charged fast. Excess heat buildup-up is caused by a charge current that is too high, overcharge or and aging battery. Read more about Ultra-fast Chargers.
    
    A NiMH charger can charge NiCd, but not the other way around. The original NiCd chargers would overcharge NiMH.
    
    To charge NiMH with a NiCd charger, estimate the time and disconnect the charger manually. Do not leave NiMH on charge longer than needed (full charge detection may not work and the trickle charge current is too high for NiMH).
    
    Do not leave a nickel-based battery in the charger for more than a few days, even with correct trickle charge. Remove and apply a brief charge before use.
    
    Nickel- and lithium-based batteries require different charge algorithms. Unless provisions are made, these two chemistries cannot share the same charger.