- Which are better, NiCd batteries or NiMH batteries?
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I normally answer that question by simply saying 'hundreds'. The reason I can't be more precise is because this is a more complex question to answer than it might seem. The number of times a battery can be recharged depends on how the battery is used. An analogy that is sometimes used is to compare a rechargeable battery to a loaf of bread. Suppose someone asked, how many slices can be cut from a loaf of unsliced bread? The answer, of course, depends on how thick or thin the bread is sliced. If the slices are very thin it can be cut into more slices. The same is true for recharging a battery. Every time a rechargeable battery goes through a charge and discharge cycle it loses a tiny bit of capacity.
If the battery is completely discharged before it is recharged, that takes a bigger 'slice' of the battery's capacity, if it is only partially discharged a before recharging, it uses up a smaller 'slice'. A NiMH battery can be charged and discharged hundreds of times, but whether that means 200 times or 800 times has a lot to do with how big of a 'slice' you take each time.
What does mAh stand for?
mAh stands for milli Ampere hour or milli Amp hour. It is a measure of a battery's energy storage capacity. If you think of a battery as a small fuel storage tank, which in a sense it is, mAh a measure of how much 'fuel' the battery holds. (This is roughly comparable to using gallons to measure how much fuel a gas tank can hold. The more gallons of capacity, the more fuel the tank can hold.) With a battery the higher the mAh rating the more electrical energy it can store.