Battery only 1yr old and has 12.72 voltage
With your battery measuring 12.72 volts, you might not have good contact on the battery terminals. Ensure that the clamps are cleaned with a wire brush to remove oxidation and other corrosion which can prevent current flow.
Make sure that you only add distilled water. Impurities in tap water can cause the acid to become contaminated and reduce battery life.
Although you disconnected the battery, it might experience leakage on the outside of the battery, or internal current leakage that will discharge the battery.
Other problems with your car's computer can occur when the battery is disconnected and it loses power to its memory. This can affect the car alarm too. Check your owner's manual.
Ultimately you will need a new battery.
Inthe short term, pry off the small covers and ensure there is enough acid solution to cover plates inside... Not completely full, about 3/8" down.
Then once all ok on fluid (add water if low), charge battey for a while or get a jump start. AAA is your friend for this.
Battery will not live long after being completely discharged but this may give you a little time
Testimonial: "Thank you, ill get a new battery if all fail."
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