Snowman-
The picture you saw showed what looks like 680mA on the battery label. But if you take the whole picture into consideration, it says 3.7V 2.4Wh (Watt-hours) 680(?) mA. And that math just doesn't work out. It would be about 648mA at 3.7V to get 2.4Wh.
I would note that there's always been a big market in counterfeit "Ultrafire" 18650 batteries online. When I checked ~4 years ago, every, literally EVERY vendor on Amazon and ebay was selling counterfeit product, and that could usually be spotted immediately because their numbers for voltage and amperage, as printed on the product, never quite matched the ones from the real manufacturer.
Lenmar? Gee....Pentax is like Zeus or Apollo. A god that roamed the earth for many years. I wouldn't be surprised if "Lenmar" was another "Who really knows where this came from?" because frankly, I've heard of more bogus batteries over the past 20 years than sources for genuine brand name ones.
The one Steve has with "3.7v 2.9Wh 780mA" makes more sense. Actually those numbers would add up to 783mA. Gen-you-whine batteries for anything these days seem to command exotic prices, quite possibly because vendors know that they really can command a premium if they have good reputations.