Amazon.com: YongerTool 5.0Ah BL1850B Battery Replacement for 18V Battery,5000mAh High Capacity Compatible with Lithium Ion Battery BL1815B BL1840B BL1830B BL1820B,2 Pack with Mount Holder : Tools & Home Improvement
18V Charger for 18 Volt Makita BL1815 BL1830 BL1835 BL1815B BL1830B BL1835B BL1815N - Walmart.com
18V Battery Adapter Power Tool Converter For BL1815 BL1815B BL1820 BL1820B ONS | eBay