ATC LLC via Amazon offers the Masione 18-volt NiCad DeWalt Replacement Battery, model no. DC9096, for $21.99. Coupon code "B9CMVHGA" cuts it to $18.99. With free shipping, that's the lowest total price we could find by $4. (For further comparison, we saw a 2-pack for $37 shipped last week.) It's compatible with select DeWalt DC- and DW-series tools (check the product page to see available listing) and features overcharge-protection and no memory effect. Deal ends January 31.