I know it's probably not what you wanted to hear, but there is probably nothing "wrong" with your gear.
Assuming the inverter and the charger are working normally, it is, as they say, just one of those things.
SLA batteries generally follow a reasonably predictable life-cycle, but occasionally one doesn't.
Same with their death, they'll usually fade away gracefully, but occasionally one will just die. Here today, gone tomorrow.
As to your particular batteries "life", depending on the manufactures inventory, wholesales stock policies, shipping, moon phases, PCB sales-cycle, the battery could go from factory to your house in under a month, or closer to a year.......
So the good news, if you like, is there's probably nothing "wrong", your battery has just died.
AB
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