When I'm at home, is it better to use the laptop plugged into AC power, or with just the battery, for the overall battery life?
Answer
It won't make all that much difference. What will shorten battery life is temperature: If it gets hot, it will shorten the battery life. Best thing to do, if you are able, is to remove the battery while you're at home and keep it somewhere cool.
If it's a Li-ion battery, then they don't like to be completely discharged, so make sure you charge them regularly. Wikipedia:
Lithium-ion batteries should not be frequently discharged fully and recharged ("deep-cycled"), but this may be necessary after about every 30th recharge to recalibrate any electronic charge monitor (e.g. a battery meter). This allows the monitoring electronics to more accurately estimate battery charge.[26] This has nothing to do with the memory effect.
More tips can be found here:
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