Amazon.com: Synergy Digital Power Tool Battery, Works with Makita BHP441 Power Tool, (Li-Ion, 14.4V, 3000 mAh) Ultra High Capacity Battery : Tools & Home Improvement
New Makita 763196-5 Keyless Chuck 13mm, 1/2"-20UNF for BHP441 BHP451 BHP454
New Makita 183G51-1 Housing Set for DDF441 BDF441 BHP441 BDF451 BHP451 | eBay
Makita Gear Assy Bhp441/451 125430-5 from Spare Parts World