I am fascinated by battery technology and found an AMAZING price/capacity ratio for deep cycle 12v LifePo4! Then we finish up with AMD's 3000XT series upgrade.
https://www.geektherapyradio.com/$45 16ah 12v LiFePo4
https://www.amazon.com/LiFePO4-Battery-Miady-Rechargeable-Maintenance-Free/dp/B07X7MD2JK/ref=sr_1_1?dchild=1&keywords=lifepo4&qid=1594256704&sr=8-1