Compatible 18650 battery for LED SERFAS bike light

A custom designed, same-side power proprietary 18650 replacement battery with a capacity of 3500mAh capacity, compatible with most Serfas LED bike lights. Equipped with a built-in protection circuit, safeguarding it from overcharge and over-discharge. Key Specifications: Battery Type: 18650 Chemistry: Lithium-Ion Capacity: 3500mAh Configuration: Proprietary (Same Side Power) Nominal Voltage: 3.7V Maximum Charge Voltage: 4.2V Dimension: Diameter 18.6 x Length 68mm Protection: PROTECTED Compatible models: TSL-500M TSL-500R TSL500RW TSL-600C TSL-750M TSL-750R TSL-750RW TSL-1000M TSL-1000R TSL-1000RW TSL-1100C TSL-1100M TSL-1300M ATTENTION: This battery is exclusively designed for charging within the original torch. It is not suitable for external charging or the use of external chargers. Please fully charge battery before use. Disclaimer: The brand names/trademarks/trade names specified are registered properties of their respective owners.