"Magicshine Micro-USB rechargeable battery compatible with all 90X, 90XB, 90XS series lights and most 8 series lights using a 5.5×2.1 mm round plug. (808, 816, 872, etc.) Can be used as a USB power bank. Recommended for use with the smaller MJ-900/900B/900S bike lights

• 2*18650 cells, 7.2 V 2600 mAh capacity
• 5.5 × 2.1 mm round plug standard
• Traditional AC wall charger and USB rechargeable
• IPX 4 waterproof
• Battery cable can be easily removed and replaced with a waterproof silicone sealing cap
• Included with MJ-900 and MJ-900S
• Not compatible with Monteer 6500S/8000S/8000S V2