So far this has been a very good third party battery for my GFX 100s. The camera tested it as "New" when I charged it and first put it in, and it gave me reasonably close to what I get from Fuji's OEM battery. I typically buy another brand of batteries, have for years, and at least as a new battery, feel that this K&F is closer to the capacity of the OEM. But—I've only used it through two recharge cycles so far; so I can't comment on ultimate life or how the capacity will decline with age.

So—the new features, to me, at least: A snap on bottom cover! After I got this, I searched Amazon to see if anyone was selling just these covers to fit onto the NP-W235 batteries, I'd love to buy them for all my batteries. The other main feature is that there's no charging station—the battery includes a built in circuit to do this, and they include a cable (USB C!) (another nice surprise) that goes from any USB charging station directly into the battery. Now—this is either a positive or negative feature. You can also charge the battery in a regular charger.

It shouldn't matter, but I also like the look of a white battery. I think every digital camera I've had for the past 30 years has had black batteries, so it's just nice to see something different. The included cable is heavier duty than the usual "tossed in" charger cable. My sense is, after three K&F product purchases, that K&S is trying a hit a more select market niche, with the goal of becoming a well known, and respected brand.