ATC, LLC via Amazon offers the Masione 18-volt 2,000mAh NiCd Power Tool Battery
, model no. 8940158631, for $26.99. Coupon code "KD676IW4" cuts it to $19.99
. Plus, Prime members receive free shipping
. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.60.) That's $7 off list and the lowest total price we could find. It's compatible with Milwaukee brand 48-11-2230, 48-11-2200, and 48-11-2232 tools.