Having spare batteries to run your dive light has some major advantages. If you are planning to go on a live-aboard dive trip they are a must. Keep your light lit with freshly charged spare batteries and experience no down time between dives, because you must wait for your battery to be quick charged. Rechargeable 18600 3500mAh 3.6V battery, designed for Sea Dragon Mini 600, 650, 900 and Mini Fluoro lights (see SKU's: SLF650, SLF673, SLFSDM9PK, SLF655) as well as other light brands. The battery features a true 3500mAh capacity and is ultra-durable. The cell is a Panasonic-Sanyo NCR18650GA. Internal PCB protection and innovative impact-resistant design. Great save-a-dive-kit item. Always carry spare batteries. Never pay island prices.