With promo code “FAVEDEAL20”, this 2-pack of third-party 20V Max 8.0Ah lithium-ion batteries compatible with DeWalt 20V Max tools drops to $32 at eBay. Similar generic batteries cost at least $45 at Amazon. The batteries carry CE, UL, FCC, and RoHS certifications and are listed with a 5-year manufacturer warranty. Coupon ends June 14.  Shop Now at eBay