Review on Power Up Your Tools: Get Waitley'S 2-Pack BL1850B-2 18V Replacement Batteries With LED Indicator by Sonny Nevers

Batteries fit and charge as they should. I have Makita 36v equipment that uses the two battery system. The batteries spend down at different rates and when one reaches at or about 20% the equipment starts a warning stall. It's really helpful to see the available power in numeric form by percent, rather than the less informative bar display. With the numbers, monitoring which battery of the two is lowest makes swapping out much less of a chore, as it is usually the case, that only one battery at a time requires changing. I have only had these for a couple of months, but reliability and durability do not appear to be an issue.