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Some batteries like the NiCads used in power tools will not last as long as they could because of their developing a memory effect. Some people say this condition does not exist but that is open for debate. Memory effect comes about by not letting the battery fully discharging before charging it again.
After developing this condition the battery does not fully take a charge, it is only a partial charge. As the battery goes through more charge and discharge cycles, it continues to take less of a charge until it becomes useless. There is a repair for this that can be done at home.