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How long is the battery life.

The battery life depend on the battery attribute: capacity and efficiency. For example, suppose the D battery you test with 1.5V / 10000 mAH, 8 pcs battery with 6V / 10000 mAh *2, and efficiency 70~80%. 1 A= 1 000 mA= 1 000 000 uA. For 7″ SAD0705K, consumption (standby) 5V/<1 mA, consumption (playing) 5V/450-550 mA;
8 pcs battery can last playing: 20000 mAh / 550 mA * 0.7= 25.5 H

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