Sharp Aquos R2 Notes On Usage page 30

■ Internal battery
(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. Also charge the battery after long periods of
disuse before using the product.
● Use in very hot or cold environments, for example, when left in an
automobile with the windows closed in summer, will cause the internal
battery capacity to drop and shorten the available battery usage time. This
will also shorten the internal battery's service life. Try to use the internal
battery as much as possible at room temperature.
● The internal battery gradually discharges after charging even if the product
is not used. The internal battery may discharge completely after long time
no use. Charge before using the product.
● 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), the internal battery is at the end of service life, so
stop using it. Since the battery is built-in type, the product will be kept at an
au shop etc. and charges will be incurred for repair. Also, you may not use
the product in certain period of time. Note that the length of service life
varies depending on the usage condition, etc.
● Because the internal battery performance or service life will become low,
do not store the product in the following conditions.
• Battery level is full (soon after charging is complete)
• Battery level is empty (to the extent that the product is not powered on)
• In extremely hot or humid conditions
● Internal batteries sometimes swell up as they approach the end of their
service life depending on the usage condition. This is due to the properties
of lithium-ion batteries, and is not a problem in terms of safety.
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