On 5/1/15 2:03 PM, micky wrote:
Someone gave me an old car battery charger.

6 volts 10A and
12 volts 2A and 10A, determined by a slide switch.

A friend brings over a dead 12v battery.

On the charger, on 10A, it charges at 9amps.
On 2A, it charges at 7 amps.

Based on the meter on the charger.

What does it mean to be a 2 amp charger if it charges at 7 amps?


After an hour the charging rate dropped to 6 amps on the 10A setting,
and then it was 5 amps on the 2A setting.


I'd take the battery off the charger and use a multimeter to see if the
terminal voltage was over 11.5. I'd let the battery sit overnight and
see if it was still over 11.5. Why fool with a battery if a cell is shorted?

If the voltage was good, I'd use the multimeter to check the charging
current. If it really charges a good battery at 7 amps on the 2 amp
setting, that would explain why someone gave it away. I'd check the
charging voltage because the charger could damage batteries if it's too
high.