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also, never run a lithium battery dead, it kills them.
my company bought a whole bunch of makita 18v pover tools, one guy insisted they needed to be completely dead, so he would put them in the drill and tie the trigger down until it stopped, he needed to get replacment batteries 3 time in as many years, and makita wouldnt warranty them because the chip inside showed just what he had done. we have guys who switch batteries with fresh ones every hour or better, and they have batteries going on 7 years now
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