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I have 2 18v Hitachi EBM1830 batteries that came with a 8 tool combo kit. Tried using my hammer drill, 1 battery works fine, the other says fully charged on the charger and when I use it with the drill, it runs about a minute before the drill quits. I can immediately place it back on the charger and it shows fully charged. Both batteries read 20.4v with a voltmeter. Bad battery?