Axle instead of crank - electronics are well protected
Even though the Rotor InPower belongs to the category of crank power meters, the power is not measured there at all. Instead of in or at crankarm, Rotor measure torque input at the crank axle. This technically happens more on the left-side, but because the measurement takes place in the axle it really doesn’t matter. Either way, as a cyclist you don't notice it in action. Therefore, it is only mentioned for the sake of thoroughness. The electronics are well protected in the bottom bracket shell and are safe from external influences. From water, for example. And speaking of electronics: You also don't have to worry about the battery and/or its runtime. 300 hours of operating time are possible. At least in my case - plus/minus my sloppiness in the exact time tracking. Nevertheless, it is unproblematic to change the battery when necessary. In short, take of the left crankarm, change the battery, put it back on and done. On the bike, when power is there, the full range of performance measurement is available: power, cadence, torque efficiency and pedal stroke.