Dead auto battery cause I left the AC on

Could not find my car keys!  Then I remembered I left it on AC while tuning an antenna 3 hours ago🙁. Thankfully I use car jump batteries to run my radios so time.  Today I was monitoring 2 meters, no contacts🙁. So I took off the 8amp hour jumper battery and put it to the auto😎. It started on the first try👍

The 8 amp battery started out 100% full and showing 12.4volts when I turned on the radio 3 hours ago  after the.car jump it wS at 70% and 12.2 volts😎