This charger is a dream for any mechanic if you're not in a hurry. I use batteries (900 amp AGM) to power my cameras and other gear, run the batteries for 4 to 6 weeks and then go and charge them. I have set up 12 volt batteries for 24 volt series and these little chargers work fine. me the state of charge and how many amps the charger is charging. Plug them in in the morning and the batteries will be fully charged the next morning. I also have a car that I don't drive much and I've been careless with the battery. The battery starts the car, but if it does not start the first time, remove the jumpers. I connected this device to the battery and it worked. It started charging at 4.3 amps and said the battery was 60% charged, after 20 minutes it said the battery was 25% charged and charging 7.9 amps. I left the charger plugged in and the next morning the charger showed a full charge and it was charged. I tested the battery with my trusty pile of coal and the battery exceeded its rated inrush currents. I love it and would buy more if I needed them.
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