Re: DeWalt 18V XRP Cordless Drill Driver. Should performance of the drill slow as battery becomes weaker? My drill works fine for quite some time then suddenly loses all power, even the light won't work. I put a second battery or recharge the old one and it works fine again. Is this normal for a Nano Phosphate Lithium Ion battery?

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Yes. It's kind of like a flashlight when your batteries get low the light get dim, but if you replace the batteries light gets bright again. The drill will get weak as battery get low.