Yamaha HAIBIKE SDURO HardSeven SL Original Instructions Manual page 83

Top of the case
Battery bottom
Key lock
Battery handle
10. Mount the battery pack on the bicycle.
Insert the battery in the direction of the arrow so that the battery bottom
is aligned to the top of the case.
Insert the upper part of the battery in the direction of the arrow so that the battery
handle is aligned to the top of the key lock.
Press the upper part of the battery toward the frame until it clicks into place
to secure it. Make sure that it is securely attached by pulling the battery
after installation.
Make sure there is no foreign matter on the battery
pack contacts before inserting the battery pack.
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