Synergy Digital Power Tool Battery, Compatible with DeWalt DCS310N Power Tool, (Li-ion, 12V, 4000mAh) Ultra High Capacity, Replacement for DeWalt DCB120, DCB121, DCB123, DCB125, DCB127 Battery - Walmart.com
DEWALT 12-volt Max Variable Speed Cordless Reciprocating Saw (Charger Included and Battery Included) at Lowes.com
DeWalt DCS310 12V MAX Cordless Lithium-Ion Pivoting Reciprocating Saw Bare Tool