Verykool s400 - Manual (Page 18)

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Super sleek, useful charger can charge the mobile phone very quickly.
Plug the charger into the electrical plugs and connects the other side
connects to the left side of the phone.
You can check the charging progress in the screen of the phone, it
will not power on automatically when charging.
Care and Maintenance
 Battery Care
• Your device is powered by a rechargeable battery. When the power
is weak, please charge the battery. In order to extend the lifespan of
the battery, use all the battery's power before recharging.
• Unplug the charger from the electrical plug and the device when not
in use. Do not leave the battery connected to a charger more than a
week. Overcharging may shorten its lifespan.
• Extreme temperatures can affect the ability of your battery to charge.
Battery needs the fit temperature. If the surrounding temperature is
over 40°C, the battery cannot be charged.
• Use the battery only for its intended purpose. Never use any charger
or battery that is damaged.
Do not short-circuit the battery. Accidental short-circuiting can occur
when a metallic object such as a coin, clip, or pen causes direct
connection of the positive (+) and negative (-) terminals of the battery.
(These look like metal strips on the battery.) Short-circuiting the
terminals may damage the battery or the connecting object.
• Leaving the battery in hot or cold places, such as in a closed car in
summer or a freezer in winter conditions, will reduce the capacity and
lifetime of the battery. Always try to keep the battery between 59°F
and 77°F (15°C and 25°C). A hot or cold battery may not function
temporarily, even when the battery is fully charged.
• Battery performance is particularly limited in temperatures below
freezing.