I flattened a Noco GB70 in like an hour trying to charge a drone battery. The charger alerted me after a while the input voltage was out of range and sure enough it was the jump pack. It's internal meter read it gave all it had so I plugged it into the truck to charge.
I think my charge rate was set to 6 amps, it's a 6300mAh 3S battery, so I'm not really surprised, but I was hoping it would have it in it to top off my drone battery, since the jump pack stays in the truck and I can recharge it from the vehicle easily. I have a 18Ah / 20 hour Lead Acid battery I normally use for portable charging, it can top off one drone battery for sure. It's just bigger, heavier, and more difficult to charge on the go.
What I need to do is cut out the middle man and charge from the trucks Odyssey 2150, but I need to rig up some connectors, I've tried 12v cig plug type but keep running into fuse issues.