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Re: batteries show charged but no pwr
Clamp one side of [power line of your charger insert baterry pack,if amphere increase the battery pack was ok.select battery good one still run impact diver insert to the charger amphere increase good charger and battery pack. Two only the problem Battery pack or charger, if charger not function , the power transistor will be replace or buy new charger.
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From what I've seen.....usually when Lithium batteries won't charge it's because they lost too much of there charge. As soon as a Lithium battery shows signs of weakness they should be charged. But to answer your question most chargers do have a fuse soldered to a circuit board so yes it's possible to be a fuse but not usually "simple".
Batteries sometimes get like yours, after a full charge they last only a couple minutes on the tool. It's usually because of a bad cell in the battery. The only fix is to replace the battery. If you just bought it, take it back for an exchange of the battery or whole tool kit. If the retailer you bought it from won't exchange it contact the company it came from to find out how to get the battery replaced under their warranty.
Your batteries are tired and don't put out enough amps to power your drill. They may show 18V in them on a tester and show fully charged on the charger but one or more of the cells inside are just worn out. If you got three years out of them you did extremely well. The only fix is to replace the batteries.
these newer chargers do make a tone that can be changed. when the batterys are initially inserted they will make a sound and then when they are fully charged they will make another usually longer sound. you can change it by removing the battery with 5 seconds and reinserting until you find the sound that you like.. I would look at the charging lights before deciding the charger or battery are bad.
Do you have more than one battery and if so do they both do this? It sounds like the batery has shorted out or possibly the switch is malfunctioning and creating the short either way I would not try and recharge a battery that has these symptoms. I actually had a NiCad battery catch on fire when I charged it not knowing the history of battery. There are repair centers that usually won't charge you to check batterys/drill or maybe a minimal fee but it is cheaper than replacing batterys constantly. Good luck. Dave