Fully agree - you have a nearly dead battery.
Also it looks like you have one of the AGM reproduction batteries (do not add water tag is a giveaway). Those need a specific AGM rated charger. The supplier will not honor the warranty if the battery is damaged by a traditional wet lead/acid
battery charger. The supplier also recommends
charging the battery on the AGM 10A setting about every 90 days as the voltage regulator for a standard wet lead/acid battery will not keep an AGM fully charged.
I found out AFTER I bought the AGM reproduction when I complained to the vendor that it would not take a charge from the generator. So off to
NAPA to buy a new $110 AGM charger, after the $400+ battery.... No issues since then with the AGM charger every few months. But I'm not planning to buy another ridiculously expensive AGM battery for an antique car.
