The Jumpr Quad doesn't provide 9200 mAH with 4 AA batteries. I like EnerPlex, but that's a false claim. Since the batteries are used in series in order to achieve the 5V power output, their milli Amp Hours don't add together. If they were used in parallel, then sure, you would have a 1.2 V power supply with 4x2300=9200mAH. But that wouldn't be high enough voltage for USB. So they're used in series, which means that their voltages stack, but not their mAH. 4x1.2V = 4.8V power supply with 2300 mAH.
Talking about mAH without taking voltage into consideration doesn't make sense. So we have to include the ~5V output voltage of the power supply, in which case 2300 mAH is the correct value, not 9200.
Date published: 2016-06-19