Amazon.com: Synergy Digital Power Tool Battery, Compatible with Makita HP331D Power Tool, (Li-ion, 12V, 2500mAh) Ultra High Capacity, Replacement for Makita Battery : Tools & Home Improvement
New Genuine Makita 629167-1 DC Motor 10.8V for HP331D | eBay
Synergy Digital Power Tool Battery, Compatible with Makita HP331D Power Tool, (Li-ion, 12V, 2500mAh) Ultra High Capacity, Replacement for Makita Battery - Walmart.com