Amazon.com: Synergy Digital Power Tool Battery, Compatible with DeWalt DCF621 Power Tool, (Li-ion, 14.4V, 4000mAh) Ultra High Capacity, Replacement for DeWalt DCB140, DCB140-XJ, DCB143, DCB145 Battery : Tools & Home Improvement
14.4 Volt 5.0Ah Lithium-Ion Power Tool Battery for DeWalt 14.4V DCB140 DCB141-XJ | eBay