Over time. we heard a lot of complaining online in e-skateboarder community that the plastic battery case is prone to scratch or even safety issue. because it is under the deck and may hit the bumper unless like boosted board which has battery box very close to the wheels.
We use an aluminum alloy to make the BoardUp-E battery case, it is actually not that heavy. It weighs about 1lbs. and more importantly, because of the good heat conducting of aluminum. BoardUp-E will never have overheat issue which may slow down the motor unexpectedly in some situations.
And because of that, our battery case is the most compact design in the world which holds 20 18650 Samsung batteries inside together with ESD board.