LG MM-535 Owner's Manual page 173

The guidelines listed below help you get the most out of your battery's
performance.
Use only Sprint-approved batteries and desktop chargers. These chargers are
designed to maximize battery life. Using other batteries or chargers voids your
warranty and may cause damage.
In order to avoid damage, charge the battery only in temperatures that range
from 32º F to 113º F (0º C to 45º C).
Don't use the battery charger in direct sunlight or in high humidity areas, such
as the bathroom.
Never dispose of the battery by incineration.
Keep the metal contacts on top of the battery clean.
Don't attempt to disassemble or short-circuit the battery.
The battery may need recharging if it has not been used for a long period of
time.
It's best to replace the battery when it no longer provides acceptable
performance. It can be recharged hundreds of times before it needs replacing.
Don't store the battery in high temperature areas for long periods of time. It's
best to follow these storage rules:
Less than one month:
4º F to 140º F (-20º C to 60º C)
More than one month:
4º F to 113º F (-20º C to 45º C)
For safe disposal options of your LiIon batteries, contact your nearest Sprint
authorized service center.
Be sure to dispose of your battery properly. In some areas, the
disposal of batteries in household or business trash may
be prohibited.