So excuses the wire mess, my Map tank mount with a velcro beside the battery.
The second photo shows where I had to mount my batteries, i had to build a platform for the velcro to belly wrap the battery the right side i managed to get Velcro around the structure without cut and main supports.
It just a different way for mounting batteries, I believe I got this Idea from the Rebel Max posts as this type of mounting was done in other Rebels.