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What is an Ah battery?

Amp-hours, or Ah for short, are a unit of measure for a battery's energy capacity. This rating tells us how much current a battery can provide at a specific rate for a certain period. So, for example, if you have a fully-charged 5-Ah battery, it can provide five amps of current for one hour.

What is a deep cycle battery Ah rating?

Most deep cycle batteries will tell you the Ah rating at multiple C ratings. The C rating tells you how many amp hours the battery can provide for a very specific period of time. For instance, at C/5 a battery might safely provide 26.8 amp hours. This means that is supplies 26.8 amps in the duration of 5 hours without dropping off.

How long does a 4Ah battery last?

It is also important to be aware that batteries degrade as they get older (calendar life) and the more they are used (cycle life). A brand new 4Ah battery might be able to power a 0.2 amp appliance for 20 hours, but one that has been discharged and recharged many times will last a shorter period.

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