ATC LLC via Amazon offers the Masione 18-volt NiCad DeWalt Replacement Battery, model no. DC9096, for $23.99. Coupon code "FP8I8HVO" cuts it to $11.99. Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.64.) That's $7 under our January mention, the best now by $10, and the lowest total price we've seen. It's compatible with select DeWalt DC- and DW-series tools (check the product page to see a list of model numbers). Deal ends April 22.