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. 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 other poster already explained how to test if a battery can hold a charge. Its as simple as that. 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 … Plug the battery charger and switch it on. Reading a battery charger amp meter isn't all that hard. The number is how much charge the charger is putting off to the battery. 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. https://batterymanguide.com/how-to-read-a-battery-charger-amp-meter When the charger is switched on the needle of the meter moves to the desired amps, say ten amps. My newer charger has a "percent charged" meter on the front and when it reads 100% the charger is done charging the battery. Once the needle on the battery charger is in the green, the battery (if still good) should be good to go. https://batterychargersinfo.com/how-to-read-battery-charger For instance, a 2-amp scale and even a 10-amp scale is not too uncommon. This is only half the story though. 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 … When the battery gets full it won't be pulling as much charge. Reference Website: https://batterychargersexpert.comCredit: https://www.youtube.com/watch?v=ejW4MHdShT0***See the recommended products as below : ***- … 3) Multiple Scales. Click to see full answer Besides, what should a battery charger read when fully charged? With new phone USB chargers 5v is standard across the board so the higher the amps you buy the better. Green good, red bad. 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. To really test a battery, you need to take it to a shop, and have it load tested. First remove the negative (black) cable and then the positive (red) cable. The numbers you are reading are for the battery itself and only concern replacing the battery. Pay close attention to all the warnings. If the charger has sufficient amount of power flowing through it, it's more than … It's that easy to read the meter on your battery charger. 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