Mine does it too as I'm not going to sit and watch my phone charge exactly to 100% lol
However, when I'm on my PC and the phone is charging right next to me I get the chance to see it charge to 100% then 10 minutes later look at it and it's at 98% still on the charger . I've caught it at 100% a few times (trying and not) and then I don't get that initial quick drop like you're saying.
Not a big deal at all I agree was just pointing out what you're probably experiencing.
I've read somewhere that the GNex stops charging when it reaches 100% and discharges to ~97-98% and then again charges backup to to 100% and repeats. This is why you see so many "My phone only chargers to 98%" threads around. I believe this is better for the long term life of the battery.
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