I had a marginal battery I wanted to replace and was willing to pay cash for, but the clerk refused to sell me one at first because the hand-held tester said the battery was "good." I told him I was not asking for any prorate or warranty because I bought the battery elsewhere, but he said the company would discipline him for selling a new battery when the old one tested usable.
I told him the the battery had already failed once and stranded me and that the company would get a legal complaint from me if they sent me away and I got stranded again. I have driven cars making deliveries and daily to earn a living for over 40 years. I repair my own vehicles and have tools to test. The person testing agreed to a second test and this time the battery 'failed.'
There is no way a cheap clipon tester could accurately determine a 700 amp draw. That is outright fraud.
If your battery is reading 14.8v accurately under no load, then your alternator regulator is way our of wack and is destroying the battery internally. That's your fault, not the battery maker.