Samsung SPH-M300 User Manual page 52

Caution!
Charging the Battery
Your phone's Li-Ion battery is rechargeable and should be
charged as soon as possible so you can begin using your
phone.
Tip: It is recommended that you completely charge your battery
before first using your phone. This guarantees you begin
using your phone with a fully charged battery.
Keeping track of your battery's charge is important. If your
battery level becomes too low, your phone automatically
shuts off and you will lose all the information you were just
working on. For a quick check of your phone's battery level,
glance at the battery charge indicator located in the
upper-right corner of your phone's display screen. If the
battery charge is getting too low, the battery icon (
blinks and the phone sounds a warning tone.
Always use a Sprint-approved desktop charger, travel charger,
or vehicle power adapter to charge your battery.
Warning:
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Be careful not to damage the contact pins during this
process.
Using the wrong battery charger could cause damage
to your phone and void the warranty.
Section 2A: Your Phone: The Basics
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