Yangdock E-Commerce via Amazon offers the Masione 18-volt 2,000mAh Ni-Cd Replacement Battery for Black & Decker, model no. HPB18, for $18.99. Coupon code "MASHPB18" cuts it to $15. Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.30.) That's $3 under our mention from October, the lowest total price we've seen, and the best deal now by $4. It's compatible with Black & Decker 18-volt tools and chargers. Deal ends January 15.