Been boring through some floor joists with the hammerdrill driver from the 4pc combo set. I did not have it set to hammer function but when the boring got ruff, a lot of vibration the battery would pop off all on its lonesome. Pretty tuff case survived the 8 plus foot falls without a mork. Why is it doing this? Any help, my other battery hasn't done this once. I don't see any difference between them. Thanks all John I am very happy with this set so far just a little diappointed in this problem. I upgradedfrom a firestorm set precisely for this reason. Thanks again and Merry Christmas. John
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