Sorry I just saw this post! I to have a Milwaukee impact going on 4 years now. If you do not use it very often say at least once a week. Then you want to run your battery all the way down and do a full charge on it once a month. The reason being is that they have a memory setting in the battery and it will pick up how often it charges. If it doesn't get a used that much it won't hold a full charge any more! Hope this helps!

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