You are looking at a Shimano Di2 Dura-Ace battery charger for external batteries. It Charges a Di2 battery in about one and a half hours. Whether you are charging the battery you are currently using or just juicing up a spare, it's always a good idea to have all your batteries topped off.
Specifications
- Charges Shimano Di2 batteries
- Charge time: 1.5 hours
- Power cord sold separately