I have been using 3rd partied battery with Japanese Cell for both 5D Mk4 and GH5. All got from Taobao. You can specify Sanyo, Panasonic, Samsung or LG cells to be installed with different MAh. They will install for you with the chip and casing. Ultimately, You will know what you are getting. I use it since day 1, Sonfar so good, I do not see any different in performance for Photo or video. In fact some even last longer than the OEM if you get higher Mah. They are not the cheapest but definately cheaper than OEM.