I would bet you can shave off 50 grams and it would still fly. I have several and will give it a try. But.. and the but is will that make it legal as a "non-drone". Or is a Tello a "non-drone", that the FAA will worry about knocking down aircraft? Or do the little 25 grams drones that Walmart sells still have to meet all the drone criteria?
I know you don't have to register them if the weigh under 250 grams, but what regulations do they have to meet if they are under 250 grams? - or in the case of the "Tellos" at 85 grams? I just gave my kid a couple of Tellos for the grand-kids to play with and told him not to worry about it.