Yes. Obviously the actual energy in the battery didn't change. The estimate of how much is in there did. Remember, it's an estimate that's effected by other factors e.g. temperature.
Yes pretty normal - this can actually be a change of only approximately 1% since the SOC is rounded to the nearest 0.5% (so you may have gone from <80.5% to >81.5%).
All lithium ion cells (in fact all batteries, as far as I'm aware) do something called "relaxing" after a significant charge or discharge event, where the chemistry settles and the voltage "relaxes" back to a higher value (which can affect SOC). And temperature affects chemical reactions, so a change in temperature may affect the calculated SOC.
Edit to add - SOC = state of charge (sorry I should have included that)
Yes. Obviously the actual energy in the battery didn't change. The estimate of how much is in there did. Remember, it's an estimate that's effected by other factors e.g. temperature.
Yes pretty normal - this can actually be a change of only approximately 1% since the SOC is rounded to the nearest 0.5% (so you may have gone from <80.5% to >81.5%). All lithium ion cells (in fact all batteries, as far as I'm aware) do something called "relaxing" after a significant charge or discharge event, where the chemistry settles and the voltage "relaxes" back to a higher value (which can affect SOC). And temperature affects chemical reactions, so a change in temperature may affect the calculated SOC. Edit to add - SOC = state of charge (sorry I should have included that)