Extended-range 48V 17.5AH battery in the longer-style form factor for 2016-2019 Surface 604 Rook and Colt eBikes. This higher-capacity pack delivers more range per charge than the standard 13AH version, making it ideal for riders who want to go further on their older commuter bikes.
Will not fit 2020 or newer models, which use a different, shorter battery mount. Samsung cells provide consistent power output and long cycle life.
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