XLH Xinlehong 18650 battery pack holder

I wanted to put 18650 battery pack on my xinlehong rc car because it is the cheapest battery source. So I created a holder into which this battery pack can be clipped and pulled down with velcro just to be sure. Thanks to this solution, I can have two accumulators in the car, one from the 18650 cell with a capacity of 2000mAh and the other original one with a capacity of 500mAh