"It's quite possible that the practice of completely draining tool
batteries before charging originated from the manufacturers of
earlier-generation tools. Regardless, now we know better. Do not
completely drain your batteries by holding down the trigger. As soon
as you detect that the tool performance is diminished, it's time to
recharge."


Plus how would the normal person drain them? and then not over drain them and
cause them to reverse?

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Knight-Toolworks & Custom Planes
Custom made wooden planes at reasonable prices
See http://www.knight-toolworks.com For prices and ordering instructions.