21v lithium-ion battery pack for dayi

This Dayi replacement battery pack has two batteries, uses the internal use of the battery cell is different, model D216005 used 18650 lithium-ion battery cell is 2000mah-5c, model D216010 used 18650 lithium-ion battery cell is 2000mah-10c. 4000mah/6000mah could be made, also can be custom. welcom to contact us. Our products have many authoritative certifications including Korean KC certification. You can contact me to send the relevant certificates if you are concerned.