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The hole is for a lock to hold the downtube batter in place, the button releases the battery and motor pack. Look E-765 Gravel RS Gravel Bike, 2019 Sea Otter Classic. © C. Lee / Cyclocross Magazine

The hole is for a lock to hold the downtube batter in place, the button releases the battery and motor pack. Look E-765 Gravel RS Gravel Bike, 2019 Sea Otter Classic. © C. Lee / Cyclocross Magazine