ATTENTION: Compatible with BERSERKER 20V cordless power tools only. Not compatible with other brands' machines! 【Premium Lithium Ion Battery】The Berserker 20V 4000mAh li-ion battery uses electronic control to better optimize battery capacity and long-term running performance. No memory effect can be charged or discharged as required without loss of capacity, 100% more capacity than a 2000mAh battery, bringing new life to your tools. 【Compact and Compatible】The weight is only 1.54 lbs, and the compact design is easy to install and disassemble, which is applicable to all our Berserker li-ion projects. Compatible with cordless rotary hammer drill, cordless angle grinder, Leaf Blower & Vacuum, cordless leaf blower. (Note: Berserker battery is not compatible with other brands) 【Fast Charge】It takes 90 minutes for 3.0A charger to fully charge 4.0Ah battery, and 160 minutes for 1.8A charger to fully charge 4.0Ah battery. At the same time, equipped with LED indicator light, users can monitor the battery power at any time to improve work efficiency. 【Intelligent protection】Made of high quality battery cells, built-in protection of over-charge, over-discharge, over-voltage, over-current, over-heat and others, make your use process more secure. 【Safety & Service】Comply with UL and CE security authentication, ensuring your safety during use process. We provide a 12 month warranty service, If you have any question, please contact us at any time on Amazon. This 20V 4.0Ah cordless power tool battery compatible with Berserker rotary hammer drill 111; leaf blower 134; leaf blower 175; leaf blower&vacuum 128; 4-1/2" angle grinder 109A; 7" angle grinder 118; circular saw 139; pressure washer 171; buffer polisher 169; string trimmer 164; paint sprayer 158; chainsaw 149; chainsaw 150; tool kit 101; car kit 170.