Thanks. I have 8 of the longer ones, (and perhaps some slipped out the door). I usually charge a set and stick it in the mod before handing them out to friends. The other set and charger I give out is still in original packing.
The easy way to tell the difference (without actual measurement) is that the longer ones have a positive terminal that is more pronounced... protrudes more. There are two vent holes in the positive terminal. Looking at the battery from the side, you can see the entire vent hole on the longer ones. Whereas the hole is partially obscured on the shorter ones.
Also, the long ones seem to have the oldcomicallabel. The ones with the better label seem to be OK. Actually, the better label is pretty comical also. More complete warnings, but even more spelling errors. The new label has the Caution Triangle and a recycle symbol on it.
Added Picture:
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Left, original battery I got a month or so ago. Middle, the longer battery received about a week ago. Right, normal size, new label also received about a week ago.
This looks to me like the difference between the button top vs. the flat top that some batt/manufactures support as a choice.
$0.02