Samsung YP-R0JCS-XAA - Manual (Page 14)

Use basic functions >
Connect to a PC and charge the battery
12
About batteries
Charge and store the battery at 41˚ F ~ 95˚ F (5˚ C ~ 35˚ C). •
Do not charge the battery for more than 12 hours or leave the •
battery fully discharged for a long time. Doing so may shorten
the battery life.
Depending on how you use your player, actual battery life may •
vary and may be shorter than specifi ed.
Note
The charging time may differ depending on your PC’s •
capabilities.
If you want to charge the battery on your laptop, make sure •
that the laptop's battery is full or the laptop is plugged into
a power source.
The player can only be charged by connecting to your •
PC with the USB cable. Do not use a separate USB AC
Adapter as it may not charge the battery or allow proper
operation of the player.