It's 2 x Powerpak 5.0x2 PRO. Here I'm plotting the telemetry values from my flight during the weekend including the voltage. Your batteries are amazing, they've very little voltage drop. This was my 2nd flight after fully charged batteries. I'm running on this airplane 7 x Futaba HPSA700 servos. Very low consumption, if you notice there's a little voltage drop around the 4.30' minute, this is when the flaps are deployed for landing. But other than that, the Powerpak batteries and the Royal are doing a great job. I'm very happy.
My question is why the Powerbox reset to full 5,000mAh capacity happens exactly when the battery discharges to ~4,872mAh every time. It happened during the flights and it happened here at home when I recorded the video I've sent you. This remains a mystery, hence maybe something needs to be fixed on the firmware V20.09?