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The maximum battery charging rate is often specified by manufacturers as between C/3 and C/5 - where C refers to the ampere-hour (Ah) rating of the battery. Using this terminology, a 10Ah battery being charged at a C/5 rate corresponds to a 2.0A current. Exceeding this maximum rate may damage the battery and should be done only with the manufacturer's permission. Some particularly robust batteries may be charged at a 1C rate (or even higher). However, this usually requires a charger that is custom designed for the battery. The size of an off-the-shelf charger should generally be chosen so that the C/3 or C/5 rate is not exceeded.