Well we know a few parts came from a different manufacturer, but were told they only differ in appearance. Remember the first thread with pics of the target, the battery connection looked different too. I don't think anything was said about the innards of the battery itself being different, but things are apparently subbed out all the time, upstream from leaford.
I'm not proposing the mah is different, I have no reference. I do have a competitors should be the same model, with the old ashcap, but haven't paid any attention to it's longevity vs. my bloogs. But I'm pretty sure that IF the life is shorter, then the mah must be lower. That's what mah measure.
And just to throw this out there, are ya'll sure that your vaping style hasn't changed coinciding with the new bats? I find that I'm taking much bigger longer hits than I did earlier, but I'm also using other juices too, and I'm pretty new, the new battery is when i started.
I guess if someone wanted to measure it, you could continuously run the battery by wet burn until it dies timing it, and do the same with the older battery, but you're liable to blow out a carto or two while doing so. I can't think of another real easy way to test it under load, but I'm a chemicals and plumbing guy, electro stuff beyond molecular charges don't make intuitive sense to me, once a wire disappears into a black box I tend to quit chasing it...