It can...but there is some risk of damage...though only a low risk I'd say.
I had a pack that I used to charge up at the end of a club night ready for the next week.
It was fine for a long time, about a year, but with infrequent use, so the pack staying fully charged most of the time. I left them fully charged without using it for a few weeks/month's at a time and the once when I came back to use it again the cells had swollen up considerably....this was just before charging in lipo sacks was a requirement too, so it had also been left in the car the whole time as well. I suspect the compound effect of them not being used very often and only being stored charged was bad in the end.
These days I leave them after the last run, then charge on the day of use, had no probs since.
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