The battery memory effect refers to the reversible failure of the battery, that is, the ability to recover after the battery fails. The memory effect means that the battery automatically maintains this specific tendency after being subjected to a specific working cycle for a long time. This was first defined in nickel-cadmium batteries. Nickel-cadmium pouch batteries have no memory effect, and sintered batteries have memory effect. The current nickel metal hydride (commonly known as nickel metal hydride) batteries are not subject to the definition of this memory effect.

Because of the improvement of modern nickel-cadmium battery technology, the above-mentioned memory effect has been greatly reduced, and another phenomenon has replaced this definition, which is the "lattice" of nickel-based batteries. Normally, nickel-cadmium batteries are affected by these two Ni-MH battery is only affected by the "lattice" memory effect, and the impact is smaller than that of nickel-cadmium batteries.