If your battery warms up during charging it may be on the way out.My charger will say it's finished well before 24hrs if I'm topping it up, but is still very warm to touch. If I leave it for a few days it is then a lot cooler to touch, so the battery appears to still be drawing a bit of current after 24hrs. That's using a Cteck 7 Amp charger.
I was checking the State Of Charge via ForScan to also see what happens. IIRC it was reading 82% after 24hrs (and giving the BMS the required 3hrs at less than currect flow 100mA time to do it's calibration.)
All the good batteries I've charged over the years (100's at work) have still be cold after a full charge, the warm ones have always been in questionable condition before charging was attempted.
My Kuga took 9amps for an hour before dropping down to 2 amps.
With you sat in car, ignition on but engine not running there is already a significant draw on the battery.
I reflashed my Powershift and it would have bricked the TCU without a 12 amp charger connected (my 4 amp wouldn't bring voltage up to acceptable level).
11.5 volts is bottom limit when programming a module and the car just sat with ignition on was around that!. Could have been a costly error if I wasn't checking battery voltage.
Plus people sit in car parks with radio on and engine stopped, all takes it's toll on the battery.