These are some great value and high quality sources for 48V server rack solutions. 48V server rack battery systems are the lowest cost and easiest way to build a powerful battery backup system. I recommend LiFePo4 battery chemistry, you will get the most cycles and longest life.
I have been working on a source for reliable prism cells. I recommend LiFePo4 battery chemistry for home backup solutions. You will get the most cycles, longest life and good stability. I have tested the Grade A EVE cells listed below they exceeded their rated capacity. I plan to issue a video soon on the results. They batteries come with insulating panels and bus bars. The bus bars are ridged, I recommend you replace them with flexible ones like those listed below.
There are lots of options for 12V batteries. The ones listed below are ones that I have high confidence in and are either great value or high quality solutions. I recommend LiFePo4 battery chemistry, you will get the most cycles and longest life.
Get an additional 3% off site wide at LiTime with code: Dave3
You can also purchase LiTime/AmpereTime batteries from Amazon