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My understanding with Lithium-Ions is, that to prolong battery life, you charge them when they've dropped to 30%, and take them off charge when they reach 80% of full capacity.
According to the IT bod at work, I shouldn't keep the work lappy I have permanently at home, plugged into the charger all the time. Having said that, it is an ancient HP, from darker times.
JurekB-
Yes, this is the kind of thing I was wondering about. My laptop has all sorts of stuff in the bios about battery charging settings and phones do weird stuff about overnight charging so I assume there are still some issues with charging. It's just whether it's smart enough to take that into account without manual intervention.
aggi
I was under the impression that with modern (lithium-ion) batteries as used in apple devices (and I think sonos speakers as well) the only thing to avoid is having them sit around fully charged and not using them - hence they do this "optimised charging" now where the device learns when you're needing the full charge (when you get up) and only charge the battery up to 100% shortly before that time.