Battery update

As I have mentioned before I have gone back to a sealed flooded accessory battery because the AGMs were struggling under bonnet.
For a while now i have been a bit concerned at the rate the voltage dropped off so seeing it was in the 11th month of its 12 month warranty I decided to do a capacity test.
Using a headlight bulb that drew 4.5 amps I plotted the voltage every hour and was going to run it down to 10.5 volts which is where the battery companies test them to.
It was going reasonably dropping pretty well linear and at 10 hours was at 11.5 volts but at the 11th had dropped below 9.5, so a little under 50ah from a 100 ah battery.
I spoke with the manager of the company I got the battery from as I still have my trading account with them and he agreed that was very poor indeed and didnt have a problem replacing it.
I was running short on time when I fitted the new battery and forgot that my waeco loses its memory when disconnected and turned itself on at a setting of minus 22, I noticed it some 20 hours later and it had reached minus21 so I assume it had been running constantly for that time and the voltage was still 11.5 with the compressor running, not the sort of thing I would recomend doing to a new battery but at 3.5 amps I thought that was pretty good and confirmed just how sad the first one was.