Sprint Nextel MM-A800 - Manual (Page 304)

290 Section 4A: Safety
ⅷ 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)
Disposal of Lithium Ion (Li-Ion) Batteries
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.
Note: For safety, do not handle a damaged or leaking Li-Ion battery.