Read the charger manual and make sure you understand how the charger works and what precautions are necessary. 3) Multiple Scales. Remove both battery cables from the battery terminals. Its as simple as that. The number is how much charge the charger is putting off to the battery. Battery chargers historically have just had an ammeter on the front, and when that drops to one ampere or so the battery is charged. Once the needle on the battery charger is in the green, the battery (if still good) should be good to go. Click to see full answer Besides, what should a battery charger read when fully charged? Reference Website: https://batterychargersexpert.comCredit: https://www.youtube.com/watch?v=ejW4MHdShT0***See the recommended products as below : ***- … The last thing to remember is that certain battery chargers often have two amplifier scales if they can produce different amps. When the charger is switched on the needle of the meter moves to the desired amps, say ten amps. For instance, a 2-amp scale and even a 10-amp scale is not too uncommon. https://batterymanguide.com/how-to-read-a-battery-charger-amp-meter https://batterychargersinfo.com/how-to-read-battery-charger To really test a battery, you need to take it to a shop, and have it load tested. The numbers you are reading are for the battery itself and only concern replacing the battery. If the charger has sufficient amount of power flowing through it, it's more than … All you have to do is make sure you are looking at the right scale and when you have it connected you look at the number that the needle is pointing too. The other poster already explained how to test if a battery can hold a charge. But this piece also covers on other matters like some terminology and other considerations—getting to know how to read a battery charger amp meter … First remove the negative (black) cable and then the positive (red) cable. Green good, red bad. When the battery gets full it won't be pulling as much charge. My newer charger has a "percent charged" meter on the front and when it reads 100% the charger is done charging the battery. A negative reading will indicate a bad battery charger, and you should replace it. As the battery continues to charge, the needle moves down.When the needle has dropped to almost half of the desired amp, it means that the battery is fully … Reading a battery charger amp meter isn't all that hard. It's that easy to read the meter on your battery charger. With new phone USB chargers 5v is standard across the board so the higher the amps you buy the better. Pay close attention to all the warnings. This is only half the story though. This piece can help you if you need to know what all those pins and needles on that ampere meter mean for your charging sessions. 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