Shimano Steps RIDE+ Manuel Du Propriétaire page 19

< SM-BCE60/BT-E6000/BT-E6001/BT-E6010 >
1.
Attach the charger plug to the charging port of the
battery.
Insert it with the groove side of the connector facing
up.
* You cannot insert it with the groove side facing
down.
* Charge the batteries on a flat surface indoors.
< BT-E6000/BT-E6001 >
Charging port
Groove
< BT-E6010 >
Groove
13
Battery
Backside (no groove)
Charging port