The last thing to remember is that certain battery chargers often have two amplifier scales if they can produce different amps. Reference Website: https://batterychargersexpert.comCredit: https://www.youtube.com/watch?v=ejW4MHdShT0***See the recommended products as below : ***- … Click to see full answer Besides, what should a battery charger read when fully charged? A negative reading will indicate a bad battery charger, and you should replace it. If the charger has sufficient amount of power flowing through it, it's more than … When the charger is switched on the needle of the meter moves to the desired amps, say ten amps. 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 … To really test a battery, you need to take it to a shop, and have it load tested. When the battery gets full it won't be pulling as much charge. Plug the battery charger and switch it on. Remove both battery cables from the battery terminals. Knowing how to test a battery charger, whether it’s for the rechargeable kind used in small appliances or the one that powers your automobile, can be useful for making sure that the device is reloading batteries to a usable level.The procedure for testing a battery charger is similar regardless of the type of battery you’re working with. My newer charger has a "percent charged" meter on the front and when it reads 100% the charger is done charging the battery. This is only half the story though. https://batterychargersinfo.com/how-to-read-battery-charger https://batterymanguide.com/how-to-read-a-battery-charger-amp-meter Reading a battery charger amp meter isn't all that hard. 3) Multiple Scales. With new phone USB chargers 5v is standard across the board so the higher the amps you buy the better. Battery chargers historically have just had an ammeter on the front, and when that drops to one ampere or so the battery is charged. The numbers you are reading are for the battery itself and only concern replacing the battery. The other poster already explained how to test if a battery can hold a charge. 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. 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. First remove the negative (black) cable and then the positive (red) cable. For instance, a 2-amp scale and even a 10-amp scale is not too uncommon. Green good, red bad. Read the charger manual and make sure you understand how the charger works and what precautions are necessary. It's that easy to read the meter on your battery charger. Once the needle on the battery charger is in the green, the battery (if still good) should be good to go. Pay close attention to all the warnings. Its as simple as that. 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