The internal rechargeable lithium battery eliminates the user-replaceable coin cell design that characterized earlier Garmin pedal-based power meters. A full charge delivers 90 hours of ride time, which covers multiple weeks of training for most riders. The quick-charge function provides 12 hours of operation from 15 minutes connected to USB-C power, which helps when you realize the battery ran down before heading out for a ride. Two magnetic charging clips snap onto contacts on each pedal spindle without requiring disassembly or battery compartment access. Travel mode puts the pedals into sleep state during transport to prevent battery drain in travel cases or roof racks.

Pedal IQ smart calibration tracks several factors including temperature changes since last calibration, elapsed time, and whether the pedals have been moved between bikes. The system alerts through connected Garmin devices when recalibration would improve measurement accuracy. Manual calibration requires the pedals to be unweighted with cranks horizontal, which takes approximately 30 seconds to complete. The calibration data stores in the pedal spindles rather than the pedal bodies, so it transfers when you swap between RS, RK, or XC body types without requiring recalibration.

Force data appears when you pair the Rally RK210 with compatible Garmin cycling computers or smartwatches. This metric reveals how power output responds to cadence changes across different terrain and effort levels. The data integrates with Garmin's training ecosystem and exports to third-party platforms including TrainingPeaks, Strava, TrainerRoad, and Zwift for indoor training. The pedals work with oval chainrings without requiring special calibration modes or correction factors in the head unit settings.

The carbon polymer pedal body construction reduces weight while maintaining stiffness under hard pedaling efforts. The large platform distributes pressure across the shoe sole, and the Look Keo interface provides secure cleat engagement with adjustable float depending on which Keo cleat you choose. Red cleats offer zero degrees of float, grey cleats provide 4.5 degrees, and black cleats give 9 degrees. Spring tension adjusts with a 3mm hex key to customize entry and release force. The sealed cartridge bearing system resists contamination from road spray and requires standard bearing replacement procedures when worn.

Spindle swapping between pedal body types requires an 8mm hex key, pedal wrench, and approximately 10 minutes per pedal. The Rally XC bodies accept Shimano SPD cleats for off-road or gravel riding, while Rally RS bodies use Shimano SPD-SL cleats for riders who want that system instead of Look Keo. This modularity extends the measurement system investment across bike transitions or riding style changes. Both pedals must use the same body type simultaneously—you can't mix RK and XC bodies on the same bike. The 53mm Q-factor matches most road cranks, with optional 2mm spacer washers available to increase to 55mm if needed for frame clearance or fit preferences.