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The only reason the charger is rated in Ah is the ability to correctly determine the end of charging. Generally, the charger limits the current until the battery gets to some voltage, then limits the voltage and monitors the current. The battery is considered charged when the current falls below a certain value. A larger battery will draw more current in ...


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A 100Ah battery will likely have a lower internal resistance than a 65Ah battery. That will mean that the 100Ah batter will try to draw more current when charging than the 65Ah battery. A good quality charger should be able to limit its maximum current to say for example 6A without any harm to itself or the battery. In that case it will take almost twice ...


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