> That battery seems expensive (most expensive part?)
At first, I was like "Nah, just looks like my RC car battery", but then I Googled it...and it's a whopping $1,305 [0].
I looked closer at the specs and they're insane for a battery as small as it is. They have double the energy density as measured by both volume and mass compared to my RC car batteries [1].
[0] https://www.upgradeenergytech.com/product-page/gold-v1-6s2p-...
[1] https://www.amazon.com/Zeee-Connector-Vehicles-Helicopter-Ai...
440.64 Wh, 21600 mAh/20.4V, 1250W/60A constant discharge, 170A burst for 10s, total pack weight 1332g-1335g depending on connectors which gets you to 360 Wh/kg cell density or 330 Wh/kg pack density.
Impressive, but not that far off from much cheaper mass-produced cells.
Yep, to maximize range and flight time capability, you have to have the highest energy density batteries.