Yes, by linking in another charger. The derailleurs do not use power at the same rate, so they typically do not require charging at the same time.
Can I charge both eTap® derailleur batteries at the same time?
Related articles
- How long does it take to charge eTap® derailleur batteries?
- What keeps the eTap® derailleur battery from falling off?
- What happens when an eTap® derailleur battery runs out of charge? Where does the derailleur stop?
- How long does it take to charge eTap AXS derailleur batteries?
- Does the eTap® battery charger come with the proper A/C power adaptor for my country?