This NEBO replacement battery works with the 2nd Generation Slyde King, Big Larry Pro and Slyde King 2K flashlights only. This is a genuine Nebo brand rechargeable battery……Li-ion, 3.7V 2200mAH
Features of Nebo Li-ion Rechargeable battery, 6640BAT:
• compatible with the following Nebo flashlights only
▹ Big Larry Pro
▹ Slyde King Gen 2 (500 lumen model only)
▹ Slyde King 2K
• 3.7V 2200mAH
• built in protective circuitry