Shimano Ultegra ST-6870 Dealer's Manual page 37

INSTALLATION
Installation of the battery
In the case of a built-in battery (SM-BTR2)
Installation of the Lithium ion battery (built-in type)
Bond seat post collar to inside of seat
post.
1
Insert internal battery into the collar
from the bottom of seat post.
2
Mount a washer, wave washer, and
washer to the groove of the battery
adapter, and fi x them with a snap ring.
3
(A)
(B)
(C)
(D)
(G)
(H)
(G)
(E)
37
(A)
Seat post
(B)
Seat post collar
(C)
Lithium ion battery (built-in type)
(SM-BTR2)
(D)
Battery adapter
(E)
Battery adapter
(F)
Snap ring
(G)
Washer
(H)
Wave washer
This method is used to secure it on the seat
(F)
post. Depending on the frame, the way the
battery is installed may differ. For details,
consult with the manufacturer of completed
bicycles.
Use snap ring pliers (with a claw diameter of
2.0 mm or less) to mount the snap ring.