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Unicorn said:
All the manual says that might be usefull is to charge the battery for 16 hours the first time, then every few months run the battery all the way down (just 'til the light dim), and then charge it for a full 16 hours.
Mag told me that a normal charge should only be about 10 hours.
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I let mine charge till it gets a little warm. I always discharge first. My experience has been that full charge to warm takes 22-26 hours. I do this about once a month. In the 15 or so years I have owned the light I think I am on my forth battery pack (Just bought #4). I've always used Mag battery packs. Having gotten an average of five years use out of each one I have no complaint. Surefire should take a lesson from Mag in "How to source battery packs" /ubbthreads/images/graemlins/tongue.gif