Amazon.com: Synergy Digital Power Tool Battery, Compatible with Makita CL107FDSMW Power Tool, (Li-Ion, 12V, 5000 mAh) Ultra High Capacity, Compatible with Makita BL1021B Battery : Tools & Home Improvement
Amazon.com: 12V High-Output 5.0Ah Battery for Makita BL1021B BL1041B Power Tools 12-Volt max CXT Lithium-Ion Battery : Tools & Home Improvement
2x 4.0Ah Battery for Makita 12V MAX CXT BL1040 BL1021B BL1041B +DC10WD Charger | eBay
Amazon.com: 2000mAh Replacement Battery for Makita BL1021B BL1041B, Compatible with 12V CXT Lithium-Ion,Replace Charger for Makita DC10WD,Sets of 1 pc Battery and 1 pc Charger : Tools & Home Improvement