I use these interchangeably with my OEM packs. After 3 years I cannot really tell the difference.I have not performed a repeatable comparison test but they work well enough that I do not avoid using them.They get used a lot. I use an M12 tool at least once a day.My only complaint is that they are not quite as good a fit as the OEM. But this has not been a problem for me.I have used them in 2 lights, drills, multi-tool, drivers, inflator,.
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