• Exact Capacity: Each battery features 3.85V, 1400mAh. Triple your camera runtime with a complete backup package including 3 replacement battery and a 3-channel charger with Micro USB cable
  • 4 Ways to Charge: Can be charged by wall, car, Laptop,and power bank charging for added convenience.
  • Fully Compatibility: Made to the exact specification of YI AZ16-1 battery, compatible with YI 4K/4K+ action camera
  • Charge 3 Battery at the Same Time: Innovative design allowing for charging 3 or 2 batteries at the same time and 3 independent Smart LED light indicated RED when charging and GREEN when complete
  • 100% Safety Guarantee: Features four layers of protection (over-charging, short-circuit, high-temperature, and surge protection) with a high-quality, fire-resistant construction

Works as advertised. Lasts longer than the stock Yi 4K battery.

Peace, Love and Guns on YouTube These things do seem to have a good battery life and they set positively in the charger.

I'm really liking this charger. I've bought 2 of them because I have two YI cameras. We have an inverter in the truck, so we are able to have fresh batteries as we camp and hike. Also, the batteries seem to stay charged for a good amount of time. If this changes I will update. Very happy with the value of this product.

Works perfect. I use with my Yi 4K+ action camera. As others mentioned, the batteries are ever so slightly narrower than the stock battery, but they work great. I haven't noticed any difference in charge compared to the original (both new when tested).

Nice to have extra batteries for traveling.

The charger is a smart charger with red lights showing charging and green for each battery when fully charged. Charging each battery Independently works just fine. The batteries last as long as the OEM. The YI camera battery indicator does not read them like the original. When fully charged, the original battery shows full. These batteries show as 3/4 full when fully charged. It's no big deal to me. If you ignore that they read emptier than they are at first, it's fine. It does not impact me. I just keep track of which battery is inserted. And the price is great for three batteries and a charger. I have only used each battery maybe three times. So far so good. YMMV.

Hey, you better have more than just one battery. You will regret buying the camera that goes with it. These batteries work great with my Yi 4k+. Go for it.