LG nexus 5 Important Information Manual page 9

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Don't store the battery in high temperature areas for long periods
of time. It's best to follow these storage rules:
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Less than one month:
-4° F to 140° F (-20° C to 60° C)
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More than one month:
-4° F to 113° F (-20° C to 45° C)
Disposal of Lithium Ion (Li-Ion) Batteries
Do not handle a damaged or leaking Li-Ion battery as you can be
burned.
For safe disposal options of your Li-Ion batteries, contact your
nearest Sprint authorized service center.
Special Note: Be sure to dispose of your battery properly. In some
areas, the disposal of batteries in household or business trash may
be prohibited.
Radio Frequency (RF) Energy
Understanding How Your Phone Operates
Your phone is basically a radio transmitter and receiver. When it's
turned on, it receives and transmits radio frequency (RF) signals.
When you use your phone, the system handling your call controls
the power level. This power can range from 0.006 watt to 0.2 watt in
digital mode.
Knowing Radio Frequency Safety
The design of your phone complies with updated NCRP standards
described below.
In 1991–92, the Institute of Electrical and Electronics Engineers
(IEEE) and the American National Standards Institute (ANSI) joined
in updating ANSI's 1982 standard for safety levels with respect to
human exposure to RF signals. More than 120 scientists, engineers
and physicians from universities, government health agencies and
Important Safety Information 9