I have the Goal Zero Yeti 400. If needed, I can buy a replacement battery (AGM) and the goalzero.com website has a short tutorial on how to do the replacement — pretty simple. Point being, after buying a system, will it continue to be supported by the manufacturer...

For $1197 you’re paying more than the price of a Goal Zero 1250. Compare the two...
FYI, GZ 1250 Replacement Battery w/ tutorial