Replacement 48V 13AH battery in the longer-style form factor designed for 2016-2019 Surface 604 Rook and Colt eBikes. This battery will not fit 2020 or newer models, which use a different, shorter battery mounting system.
If your older Rook or Colt is losing range, this is the correct replacement to bring it back to full power. Samsung cells deliver reliable energy over hundreds of charge cycles.
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