Actually 10 -
MA batteries weigh 140g and the Smatree weigh
ts 1450g. But your point still stands although buying 10 batteries could be very expensive. It all depends on whatelse you are carrying ofcourse but 1.4kgs is not exactly heavy.
Ah yes, I read the item weight 1.882kg, that is also the shipping weight, so yes 10 batteries as a comparo weight . . . of course you don't NEED 10 batteries to give you enough flight time for stated 6 - 10 mile hike.
1.4kgs extra weight adds up, especially with some basic hiking gear and the extra drone stuff.
Probably 4 or 5 batteries would be more than ample, if using a safe flight time of say 15 mins, that gives a decent 1hr - 1 hr 15 mins flying.
When I travel 4WD'n, the 12v DJI charger is fine at drive charging volts / amps . . . but I use a step converter anyway.
It boosts 12.7v at rest vehicle battery to 13.8v, can charge MP batteries very fast, in fact a lot faster than the mains charger.
With 4 MP batteries, I can fly almost continuously whenever I like, considering we drive for 2 or 3 hours, stop, maybe fly a couple of batteries looking around a place, drive again.
When I bushwalk (hike) a Droneguard BP250 takes all the kit and 4 batteries to give me minimum 1.5hrs flight (plenty), controllers lasts pretty well for that, but I take a small powerbank in case needed.