Nahhh, that’s wrong. They all output 3.7 volts. It’s the amps that we are discussing here. More accurately the Amp-Hours. Amp-Hours determine how long the batteries can keep a device powered on. What we have found is that many battery manufacturers are out right lying and claiming huge capacities. Then when they are tested their capacity is far far lower. Example: the 9900 mAh battery that is only 500 mAh. The manufacturers are just outright lying. Don’t worry you will get your device soon. 
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