Battery saver function of Vaio Control Center

If I routinely charge and uncharge my battery (I use the laptop unplugged for several hours each day), is there any reason to set the battery care function at 80% instead of 100%? Or is that just for laptops like my F2, which sometimes doesn't get unplugged for a month at a time?

 

The charge percentage is not the only factor that reduces its life, heat is also quite a big one. Ideally, Li-ion batteries should be stored at 40% charge in the fridge. I have the battery care set to 50% and only let it charge to 100% if I know I'll need it for a meeting or trip. On my old TX1 and Z1, I usually removed the battery at around 40% charge to avoid heating it by the laptop, but it's too cumbersome on the SVZ.

More info on https://en.wikipedia.org/wiki/Lithium-ion_battery section "Cell Life"

 

I thought the 80% was intended for frequent battery use, whereas it's the 50% that's recommended if you leave it plugged in?

 

Sure, but those use patterns are compromises between optimal battery care (40% charge in fridge) and usability. Every time you charge it more than that or heat it for whatever reason, you lose battery life. You don´t have to feel bad about it every time, but with that knowledge, you can change a few key usage patterns and make your batteries last much longer.