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NiCad's are obsolete rechargeables. They've been replaced by NiMH's which last longer, don't suffer from the memory effect, and aren't toxic.NiCad's are obsolete rechargeables. They've been replaced by NiMH's which last longer, don't suffer from the memory effect, and aren't toxic. NiCads have only one advantage over NiMH's, which is pretty minor: If you drain a NiCad down too far then a good charger can often resurrect it, but an NiMH drained too far will be more resistant to being brought back to life. NiCad batteries can suffer from a memory effect. If you recharge a NiCad before it's mostly spent, the battery will "remember" the capacity at which you recharged it, so you will have reduced the capacity of the battery. The memory effect is only a problem if you repeatedly recharge a NiCad before draining it most of the way. Doing it once in a while doesn't necessarily impact battery life. Both NiMH's and NiCads put out less voltage than alkaline batteries (1.2 V instead of 1.5 V). NiCads don't last very long before needing a recharge. They typically have 50 to 67% less capacity than alkalines and NiMH's. A nickel metal hydride battery, abbreviated NiMH, is a type of rechargeable battery similar to a nickel-cadmium (NiCd) battery but has a hydrogen-absorbing alloy for the anode instead of cadmium. Because NiMH batteries, like NiCad, produce less voltage than disposable alkaline batteries, devices which require four or more batteries might not even work at all with NiCads or NiMH's.You can't recharge NiMH batteries in an old NiCd charger or you risk battery explosion. Nickel metal hydride batteries recharge fewer times than NiCad and they perform very poorly in cold temperatures. Do not confuse Lithium batteries and Lithium Ion batteries. Lithium batteries are not rechargeable while Li-Ion are. [[Category:Electronics]][[Category:Consumer Electronics]]