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**18V 4000mAh High Capacity Lithium-ion Battery**: This replacement lithium battery comes with 18V voltage and 4000mAh (72Wh) large capacity. It delivers consistent and long-lasting power supply for G-series cordless power tools and reduces frequent recharging during DIY and professional work. **Wide Compatibility with G-Series**: Fully compatible with BL1840G, BL1820G, BL1830G, BL1813G, BL1815G, BL1811G battery packs. Works with power tools including DF457D, HP457D, JV183D, TD127D, UR180D, UH522D, CL183D and more listed models. Compatible with DC18WA charger. **Multi-protection Intelligent Circuit System**: Built-in microchip prevents overcharging, over-discharging, over-current, overheating and short circuit. Premium lithium cells feature no memory effect, allowing flexible partial charging without capacity loss. CE and FCC certified for safe daily use. **Precision Plug & Play Design**: Moulded to match the original battery interface perfectly, no extra adapter required. Simple installation and removal. It is dust resistant with LED indicator, great for home DIY, garden maintenance, assembly and construction site work. **Package Contents & Reliable Support**: Package includes 1 x 18V BL1840G replacement battery. We provide 30-day refund and 6-month warranty. For defective units, we support direct refund or resend service with 24/7 customer assistance.