Yamaha HAIBIKE SDURO HardSeven SL Original Instructions Manual page 82

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8. BATTERY PACK AND CHARGING PROCEDURE
Lock-release ring
1
2
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4. Connect the power plug of the battery charger to a household power outlet.
5. Remove the cap from the charging connector on the battery pack, and connect it to
the charging plug on the battery charger.
Do not connect the charging plug on the battery charger to a wet charging connector
on the battery pack as this can cause the battery pack to break down. Be sure to
connect the charging plug only after the charging connector on the battery
pack is completely dry. Do not apply excessive force to the charging plug or
pull on the cord with the charging plug connected to the battery.
Otherwise, the plug or connector may be damaged.
6. See "Reading the charging status", and check that the battery charger is
charging the battery pack.
7. The battery capacity display lamps will light up one by one until all four are on.
Then, when charging is complete, all of the lamps will go off.
8. Confirm that charging is complete, and then disconnect the charging plug from
the battery pack. How to disconnect the plug (see the left figure)
1 Grasp the lock-release ring.
2 Pull it out straight.
9. Place the cap on the battery pack's charging connector.