Yamaha NAVIGO, Owner'S Manual

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If you forget the date you started to use the lithium ion battery.
The battery’s manufactured date is printed on its bottom. Use it as a reference.
• The start date of battery usage is defined as the date the user charged the battery for the
first time after shipment from the factory.
(This does not match the manufactured date above.)
• Once the integral charge capacity reaches 8,000 Ah, the battery will not be usable even if it
has not been 8 years.
* The integral charge capacity of 8,000 Ah is approximately 700 times the capacity of the
“ESB1” lithium ion battery (hence equivalent to approximately 700 charge cycles, when fully
charged from 0 residual capacity).
TIP
Manufactured August(8) 31, 2018
180831