Odd battery/charge behavior

Something odd happened today with my MBP (2011)...  I'm working away with it while it's plugged into power and all of a sudden it starts charging... but I never unplugged it or lost power or anything (and it's on a mondo UPS anyway).
It's been showing 98% instead of 100%, but showing "fully charged" with a green light and from reading the articles from Apple this is totally normal.  I did manage to get it to show 100% after a SMC reset, but after a subsequent reboot it went back to 98%.  Anyway, it actually looks like it's going to charge to 100% now (99% and still showing orange light).
Has anyone seen this behavior?  Normal?  Something to consider going to Apple store about?
Thanks.

I understand the system will charge when it needs to, but in all my days with MacBook's and the like I've never seen one up and start charging AFTER being plugged in for several days and without any provocation (i.e. unplugging it for a few minutes).
My battery info all looks really good and the condition says "normal" so as long as "normal" is the same as "good" then it's probably fine.  Still odd, but fine.

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