Small 2 stoke engines are far less efficient than 30%. However 36V/9Ah, is 30 li-ion cells, or a bit less than 1.5kg in li-ion. It's possible to improve that (

Small 2 stoke engines are far less efficient than 30%. However 36V/9Ah, is 30 li-ion cells, or a bit less than 1.5kg in li-ion. It's possible to improve that (not massively) by using better cells 21700. Baring that - BLi300 is massively overpriced compared to what it costs to be produced.