new batteries should last around 12+ minutes of slow indoor flying (not hover, not sports mode). That is without prop guards of course. If you add these it's much reduced.
If new batteries fly for only 8 minutes (without prop guards) then something is wrong with tello increasing power demands. Worn motor, props pushed too far down, hair wrapped around the shafts, ...
If new batteries fly for only 8 minutes (without prop guards) then something is wrong with tello increasing power demands. Worn motor, props pushed too far down, hair wrapped around the shafts, ...