Shimano Ultegra ST-6870 Dealer's Manual page 62

CHARGING THE BATTERY
Names of parts
Built-in (SM-BCR2 / SM-BTR2)
USB cable
(A)
Battery charger (SM-BCR2)
(A)
Battery (SM-BTR2)
(B)
(B) (C)
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(A)
(B)
(A)
(B)
(C)
(D)
(D)
•
This charger is a special charger for use in
charging Shimano lithium ion batteries
(SM-BTR2).
•
If water collects in the connector of the
product side, wipe the water and then
connect the plug to the connector.
This is a lithium ion battery.
Use the special charger (SM-BCR1) to charge
it.
Micro USB plug
(Connect to the battery charger.)
USB plug
(Connect to a PC USB port or an AC
adapter with a USB port.)
Micro USB connector
CHARGE indicator
ERROR indicator
Plug for product connection
(Connect to the junction (A) or the
charging connector of the
information display.)