Yamaha YH-L700A Noise-Canceling Wireless Over-Ear Headphones - Manual (Page 6)

Handling this product
Battery-related notes
The lithium-ion battery contained in this product is a consumable item. To extend the life of the battery as
long as possible, use caution regarding the following.
(
If the product is not used for a long period of time, the charging time may get longer.
(
When storing the product for a long time, charge the product around once every six months to avoid
excessive discharge.
6
Notice > Handling this product