Rechargeable batteries offer many advantages, but there are also some disadvantages to consider.
One of the main drawbacks is that rechargeable batteries can suddenly stop working when they are empty. In devices such as cameras, flashes, or power tools, this can happen unexpectedly. Alkaline batteries usually lose voltage more gradually, giving more warning before they stop functioning completely.
Rechargeable batteries are also generally more expensive to purchase than alkaline batteries, partly because a suitable charger is required as well.
Nickel-cadmium (NiCd) batteries contain cadmium, a heavy metal that is harmful to the environment. However, these batteries can be recycled effectively. NiCd batteries are also sensitive to the so-called “memory effect”, meaning they should ideally be fully discharged before recharging to maintain capacity.
Nickel-metal hydride (NiMH) batteries largely eliminate this problem and can be recharged at almost any time without significant memory effect.