I use a Goal Zero Yeti 1250 solar generator to provide backup power in case we lose power from the utility. It provides a 100Ah AGM deep cycle battery, solar charger and inverter nicely contained in a box with wheels. I normally keep it connected to the commercial mains power to provide uninterrupted power to my two main transceivers, internet routers and Mac Mini in my office. But It’s easy to connect my folding solar panels and deploy it for portable operations.
After several years, the AGM deep cycle battery stopped holding a charge. So, I bought a replacement from Batteries Plus and swapped it out. I took photos of the innards during replacement.