What is the "Memory Effect" in Laptop Battery?

What is the "Memory Effect" in Laptop Battery?

Ni-Cad batteries suffer from the "memory effect". As a battery is continually re-charged before being fully discharged, it forgets the capacity that was not discharged. The way to avoid the dreaded "memory effect" is to fully charge and discharge the battery at least once every month. This will ensure the battery remains healthy. NiMH and Li-Ion batteries do not suffer the memory effect.