It should be obvious that battery charger ratings are optimistic fraudulent. The only way most battery chargers will produce their rated output current is if the battery is totally dead, and then only for a few seconds before their overload protection trips.If you open up your charger, you'll probably find NO circuitry to regulate either current or voltage. You'll see a transformer, a couple of diodes and some sort of thermal protection switch. If it has more than one current or voltage range, there'll be a switch that changes which transformer taps are used. But nothing that would actually REGULATE the current or voltage, unlike certain high-end chargers. The current that's applied to the battery by such a charger is not direct current at all, but rather a series of pulses that occur whenever one of its diodes is forward biased. When the battery has a low charge, those pulses will be long, and they will get shorter as the battery charges up. There's nothing you can do to increase the current unless there's a switch to change the current. And if there IS a current switch, it's just changing the transformer output VOLTAGE, which will cause the current pulses to get longer. Your best tool to go along with a cheap, unregulated charger is a good digital multimeter. You can monitor the battery voltage, which will give you an idea if you're over-charging it or not.
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