The Stages SB20 USB ports are specified to charge at 5 V, 2.1 A. This value is equivalent to a 10 W charger. This is the current charging voltage for most Apple phones and the following Apple devices:
- iPad Air 2
- iPad Air
- iPad mini 4
- iPad mini 3
- iPad mini 2
- iPad 2
For the newer generation iOS tablets, charging requirements have increased from 10 W to 12-18 W. This will result in a weak charge while plugged into the bike's USB ports. For these larger devices, we recommend pre-charging the device with the manufacturer-provided wall charger before beginning your ride. For most smaller devices, the bike's USB ports should provide enough charge to charge your device during a ride.