For an EarthX battery, use a foam spacer on both sides of the battery for a snug fit.
For the PC680, use the foam spacer on the backside at the bottom of the case. This is to adjust for the tapering of the case for a snug fit.
This battery box is strong enough to withstand 30 G of force for EarthX Lithium Batteries. It can withstand 6G of upward force and 9G of downward force with the PC680.
It only weighs .23Kg or 8oz. This unique design allows for simple, easy installation.
The dimensions of the battery box: 7.1″ L x 3.1″ W x 6.5-6.6″ (adjustable height) or (180mm x 80mm 166-168mm).