What type of battery does the C1 need? The C1 uses a replaceable coin cell CR2032 battery. Related articles Pairing Your Quarq Power Meter to a Cycling Computer What cranks are compatible with the C1? Battery Drain - Battery Drains In Under 30 Days What is the warranty on the C1 chainrings? Do I have to set my crank arm length on the P1 or Single-Sided Pedals?