Anytime you are wanting to put a project together like this on any level… you need batteries. 12 Volt wheelchair batteries are perfect as you place them in any position AND because they are 12 volt; they are compatible with automotive things like lights and LED strips.
I have tried batteries from all over and have found this supplier to be awesome. SUPER fast deliveries and the batteries last.
The 3 Main Power supplies I get are:
https://www.amazon.com/gp/product/B007XIUPCU/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
Small project
https://www.amazon.com/gp/product/B006T07BC0/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Main platform
https://www.amazon.com/gp/product/B00A82D9DK/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Wheelchair itself
I have a total of 9 of these batteries powering all my toys on the wheelchair.
Enjoy!