Now all that's needed is putting it into practice
Fascinating. My first laptop was invariably kept with the battery left in and the notebook used on mains charge. Then I took it away and tried to use it on the battery - it lasted about 5 minutes. And THEN I discovered how much Sony charged for replacement batteries.
Since then I have (i) avoided Sony notebooks (and after other experiences, nearly all Sony products) and (ii) tried to preserve the life of the battery by leaving it out of the laptop except for the occasional need to take it off the mains.
Sounds like that's as bad as leaving it in all the time :(
However, I can't help wondering whether the procedures described in the article don't come under the heading of "more trouble than they're worth." Though, I suppose we should all be doing everything we can to maximise resources, and I do hate the thought of shelling out for a new battery to keep an old laptop running.
There's also the question of how welcome a spare battery would be in the fridge ...