Amazon.com: SPANN Battery Replacement for Makita DCS550, DCS550Z, DCS551, DCS551Z, DCS552, DCS552Z, DCS553, DCS553Z, Part No: BL1430, BL1815, BL1820, BL1830, BL1830B, BL1835 18.0V : Tools & Home Improvement
Amazon.com: Synergy Digital Power Tool Battery, Compatible with Makita DCS550 Power Tool, (Li-Ion, 18V, 6000 mAh) Ultra High Capacity, Replacement for Makita 194204-5 Battery : Tools & Home Improvement
Makita DCS550 18v LXT Metal Cutting Circular Saw - YouTube