OVERVIEW:
This is a set of 2 batteries (yes, for a Nikon camera body) and a case that both protects the batteries during transport and charges the batteries (when plugged in using a USB-C PD cable). It also has 2 card slots, for normal SD cards.

MAIN POINTS:
PART 1: IS IT PORTABLE?
PART 2: IS IT AFFORDABLE?
PART 3: IS IT COMMON?
PART 4: HOW’S THE QUALITY?
PART 5: IS IT EASY TO USE?
PART 6: NEEDS ADD-ONS?
PART 7: WHERE DO I BUY?

PART 1: IS IT PORTABLE?
Yes, it's definitely portable, and that's part of why I think it's such a great idea (because the case protects the batteries).

PART 2: IS IT AFFORDABLE?
Yes, I would say it's an average price for a set of 2 batteries and a charger, but I think the design is so good (that it is both a case and a charger, and how the batteries lay flat as they charge) that it's worth more than others.

PART 3: IS IT COMMON?
It's common on Amazon, but probably not on the used market.

PART 4: HOW’S THE QUALITY?
I need to test these for a longer time (and in more situations) to be able to compare their quality, but the design, and build of the case is good.

PART 5: IS IT EASY TO USE?
Yes, it's easy to use, and I think these work better than chargers where the batteries are standing up on one end (those tend to make the batteries prone to not seating correctly, which might be bad if there is electrical arc-ing).

PART 6: NEEDS ADD-ONS?
It doesn't really need any add-ons.

PART 7: WHERE DO I BUY?
I purchased this on Amazon.

RECOMMENDATION:
My conclusion is, this is the best design for a battery case & charger I have ever come across, and I wish this was available for Panasonic batteries too. If I keep the Nikon camera, I'll probably keep this charger too.

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These reviews are just my opinion and are focused on my Q.P.A.C.E. packing method, so they're not comprehensive. I wrote these mostly to help me remember what items worked for my KIT PLANS (and which didn't). If I said anything negative I apologize, as these products still may work well for you in your situation, but they were not Q.P.A.C.E (Quality, Portable, Affordable, Common, Easy-to-Use) enough for my budget filmmaking KIT PLANS.