nickel-cadmium battery

A nickel-cadmium battery is a rechargeable battery that uses nickel oxide and cadmium as electrodes.

Often shortened to NiCad or NiCd, these batteries were once standard for cordless tools, portable electronics, and emergency lighting.

They tolerate repeated charging cycles but suffer from memory effect—losing capacity if recharged before fully draining.

Largely superseded by lithium-ion technology, though still used in some industrial applications.