REYTRIC Upgrade 2-Pack 1850mAh Osmo Action 3/4 Replacement Batteries for DJI Osmo Action 3 4 Camera and 2-Channel Charger Case Compatible with DJI Osmo Action 3 4 Extreme Battery

The case helps holding the batteries and charging them at the same time. It does not hold charge on itself, so once unplugged, the batteries get no extra juice.The batteries itself are reasonable enough and I'm not testing them to the limits, but they hold a fair amount of a long time (1+ hour) without issues or heating. I was able to record a whole little league game with it.

They work great for the action 4

Works great with my DJI Action 4

Camera will power up but won’t show percentage. And camera won’t let you use a lot of function while non DJI battery in it

These 1850mAh batteries are slightly larger capacity than the 1770mAh battery that came with my Action 4 so hopefully will provide a little better than the already impressive 160 minute rated record time. After receiving the batteries I put them in the included charging case and plugged it in with my own usb-c. They charged right up and both read 100% when inserted into the camera. The charging case is very convenient for transporting and the three batteries I now have should provide more than enough recording time for mountain bike rides. Very happy with the product so far, I'll update if there are any problems.

It is hard to keep the C charger engaged in the socket and it takes FOREVER for the batteries to charge. I wouldn’t recommend this especially not being a power bank only a charger.

I have been using my Action 4 camera quite often recently and have been wanting more batteries.I love that this set comes with a charging dock that lets me charge multiple batteries at the same time.I found the batteries to have slightly more capacity compared to the OEM batteries, and have had no issues making use of these batteries.I am very happy with this set.

No Case as advertised. I just got a charger and batteries