Samsung SCH-R250 User Manual page 31

 If the battery will no longer charge completely, dispose of the old battery
properly and replace it with a new battery.
Your phone is hot to the touch.
When you use several applications at once, your phone requires more power and
may heat up.
This is normal and should not affect your phone's lifespan or performance.
Some of the contents in this manual may differ from your phone depending on
the software of the phone or your service provider.