Emerson MP530 owner manual Power Source, Recharge the battery as follows

POWER SOURCE

When the bars in the battery indicator (in the display) become low (see
figure 1), recharge the battery as follows:	Batt LowFigure 1Batt Full

Follow the instructions below to charge the built-in internal Lithium battery:

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With the power on or off, connect the USB cable to the unit and then to the computer; charging will automatically begin.

NOTES:

• When charging for the first time, charge overnight for a full charge.

• After the first charge, the battery should fully charge in two to three hours.

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