What sort of batteries does it charge?
If lead-acid (car) batteries then an accurate voltmeter watching the
battery voltage as it charges should give you a good idea whether the
charger is working correctly.
The charger should charge the battery at its maximum output current
(if the battery is significantly discharged) to start with, then the
current will tail off when the voltage reaches somewhere in the 13.5
to 14 volts region (assuming '12 volt' battery). When the battery
gets to 14.5 volts or thereabouts the charger should then back off and
keep the voltage at 13.5 volts or so with a trickle charge.
Some smart chargers are even cleverer but you should still see the
above sort of sequence.
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