4.0Ah high-capacity Li-ion cells for longer working time (actual runtime varies by tool and workload). Built-in protection against over-charge, over-discharge, over-current, and temperature. Rugged housing, slide-on design, and low self-discharge for reliable storage. Genuine replacement battery for Seesii cordless tools. Two options are available—21V 4.0Ah and 40V 4.0Ah. Important: Choose the same voltage as your tool. 21V and 40V batteries are not interchangeable. How to choose 21V 4.0Ah — for tools on the Seesii 21V platform (compact DIY tools such as impact wrenches, drills/drivers, mini chainsaws, inflators, etc.). 40V 4.0Ah — for tools on the Seesii 40V platform (higher-power lawn & garden tools such as M16 16 inch chainsaw etc.). Specifications 21V 4.0AhVoltage: 21V (Use the original Seesii 21V charger only)Capacity: 4.0Ah (4000mAh)Chemistry: Lithium-ion 40V 4.0AhVoltage: 40V ( Use the original Seesii 40V charger only)Capacity: 4.0Ah (4000mAh)Chemistry: Lithium-ion What’s in the box: 1 × Seesii battery (21V or 40V as selected) Notes: Do not mix voltages or chargers. Check the label on your tool before ordering. Contact us if you’re unsure about compatibility.
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