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My dewalt battery charge suddently stopped working in the middle of charging a battery. It blew the internal fuse, but it blew due to a failure of 2 components on the charger circuit board. Here is how to troubleshoot this charger. There are some simple checks you can do even if you are new to electronics. Here we go through the simple checks and a repair that brought this battery charger back to life again. In my case it was free to fix, but if you had to buy everything it would be less than 10 dollars u.s.