Woot has a range of replacement tool batteries for brands like DeWalt, Makita, Ryobi, and Worx, discounted by as much as 50% right now. This includes the Simple Plus+ 18V 6.0Ah Replacement Battery 2-Pack at $54.99, down from $89.99. Prices across the sale run from $36.99 up to $93.99 depending on voltage, capacity, and brand. This deals end on August 9. Shop Now at Woot! An Amazon Company