Memorex MMP8550 - Manual (Page 7)

POWER SOURCE
6
RECHARGEABLE BATTERY OPERATION
This player has a built-in Lithium Polymer rechargeable battery. It is
recommended that the battery be fully charged before using for the first time
and when the battery is low (when low, the LED indicator will blink red slowly).
In these cases, charge/recharge the battery as follows:
1. Connect your player to the USB port on your computer using the USB
cable as shown. Then the battery will charge automatically. The LED
indicator will light red when charging and will light green when fully
charged.
NOTES:
• It takes approx. three hours to charge the battery from empty to full. When
fully charged, the unit can playback for approx. 12 hours.
• When charging the battery, you can only use your computer to transfer files
to the player; the player’s other functions will be unavailable.