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    Charging batteries with different volts/amps?

    lets say i have a battery that charges with a 9 volt 2 amps dc charger. I haven't done this but could i use a 9 volt 1.5 amp charger, or a 5 volt 2 amp, or a 5 volt 1.5 amp. Is the charge volts / amps recommended or a maximum? Detailed explanation if at all possible please