A paddling pool inflator shouldn't have flattened a car battery in 9 minutes, unless it was drawing circa 100 amps.... So it was probably toast to start with especially if it was 11 years old.
I'd try a 24 hour charge with a battery charger, or get a battery test at Kwik Fit or Halfords. If you have a multimeter - try as suggested in the video above...
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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