Samsung Galaxy Z Fold4 Notes On Usage page 36

• Note that the touch panel may malfunction if
conductive materials such as metal come close to
the touch panel when carrying it in a pocket or bag.
■ Internal battery
• At extremely high or low temperatures, such as
if you leave the product in a closed car during
summer, the capacity of the internal battery
decreases and so will the amount of time it can be
used decreases. This also decreases the lifespan
of the battery. Use the product at room temperature
whenever possible.
• The built-in battery gradually discharges after
charging, even if the product is not used. Over-
discharging may make it impossible to recharge
the battery after a long period of inactivity, so
regular recharging is recommended.
• The internal battery is a consumable item. If the
performance of the internal battery does not
recover (e.g. the usable time after each charge has
become extremely short), stop using the battery as
it is at the end of its service life. As the battery is
built-in, please contact the "Inquiries" in the " 取扱説
明書 詳細版 (Full Instruction Manual)" (Japanese)
to replace the battery. Note that you will not be
able to use the product for a certain period of time.
The battery lifespan varies depending on how the
product is used.
• Depending on the use condition, the internal
battery may be inflated as it comes close to the
end of its service life. This is due to the properties
of lithium-ion battery and does not pose any
safety risks.
34
Notes on Usage
(The internal battery of the
product is a lithium-ion
battery.)
The internal battery is not fully
charged at the time of purchase.
Charge the battery before using the
product.