There are three refurbished notebook battery types, each named for its component materials:

Nickel Cadmium batteries (NiCad battery) are hardly ever seen anymore. They have dismally low capacities (2000-3000 mAH) and contain heavy metals that harm the environment. Worst of all is the dreaded “memory effect”. When you recharge a Nickel Cadmium battery before it is completely drained, the longevity of the laptop battery is compromised. That is the memory effect.

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