For use with the Sony A7R IV camera, I got the K&F Concept 3-pack of NP-FZ100 batteries and the 3-slot charger. These battery kits have proven very useful for me over the past few months, and I am very pleased with their performance and ease of use.

The batteries appear to have good longevity in terms of how long they can discharge before needing replacement and can fire at least several hundred shots per charge, which makes these on par with Sony branded NP-FZ100 batteries in terms of capacity. I particularly appreciate the utility of a simple LED indicator on the charger that informs on the charge status of each battery slot with green meaning fully charged and red meaning charging. The fact that it’s possible to charge 3 batteries at the same time is good because these cameras drain batteries rather quickly.

The physical construction of both the batteries and charger also appears to be well-engineered – there are no cheap plastic components here. The battery tabs, for example, are nicely click-in with the camera without any possibility to wiggle. But it is even better that the kit has a car charging adapter which can be used to charge batteries in my car whenever I do not have access to an electrical outlet.

Overal for the price offered, K&F Concept offers an exceptional value with this battery kit. It is very stable for my daily use of shooting pictures and the 3 slot charger is very useful. That means I never lack power to supply all my electrical appliances within my home. Definitely the best for those who own any sony mirrorless camera.