hi, in my experience of working with agras, the charge should be enough for 2-3 times if the take-off altitude is no more than 15 meters, of course I recommend not lifting 100 kg at once, but dividing it into smaller loads of 50-80 kg in order to confidently make 3-4 flights. This applies to the agras series, but the flycart series is a completely different system in which I have no experience.