★ 【Compatible with More 】Our batteries are compatible with some major brands, for power tools bl1860b bl1850 bl1840 bl1850b-2 bl1845 bl1830 bl1820 bl1815 lxt-400 series please feel free to contact us for more model information. | ★【21 Volt Lithium Battery 】Battery voltage: 21v, capacity: 4000ah, type: lithium ion, made of 10 pcs quality lithium ion battery,can provide stable capacity and output. | ★【Charger】Support 100-240v universal standard ac input voltage.1a power adapter,us plug,led indicator to easily see the charging situation. | ★【Multi-Protect Safety System】This battery is equipped with overload protection, overheat protection & over-discharge protection. | ★【Note on Battery】In order to protect the battery, please do not charge more than 6 hours.Note: Please Fully charge the battery before its first use. Please do not charge the battery for overnight since it will badly damage the battery life. | ★【WE’VE GOT YOU COVERED】 Any Non-human Damage Or Any Reason You Are Not Completely Satisfied With Our Product, We Will Immediately Provide You A Full Refund ( Or Replace Your Item).