Shimano Ultegra R8050 Series Dealer's Manual page 152

CHARGING THE BATTERY
Charging method
Built-in type (SM-BCR2/SM-BTR2, BT-DN110)
Connect the battery to the junction A.
1
(A)
2
When the CHARGE indicator (orange) switches off, charging is complete.
3
4
Disconnect the charging cable or USB cable, and keep it at the location specified in the
precautions.
Connect the charging cable of the
charger to the junction A.
(z)
To an AC adapter with a USB port
or PC
(z)
152
TECH TIPS
•
The battery can be charged by using an AC
adapter with a USB port or connecting the
charger to the USB connector of a PC.
(A)
Charging port
TECH TIPS
•
The position of the charging port differs
depending on the product.
•
The charging time of an AC adapter with a
USB port is about 1.5 hours, and that of
computer USB port type about 3 hours.
(Note that the actual time will vary
depending on the amount of charge
remaining in the battery. Depending on
the specifications of the AC adapter,
recharging via the AC adapter may require
as much time (about 3 hours) as recharging
via PC.)
TECH TIPS
If ERROR indicator or CHARGE indicator
blinks, refer to "When charging is not
possible".