Thanx - will give PowerExtra a chance.....As @Billie Nelson said, not all non-DJI batteries are substandard. I have 3 PowerExtra and one FlyHi battery. Two of my PowerExtra batteries have over 150 charge cycles on them. They outlasted my original DJI battery which I retired long ago due to swelling. The only difference is that the LED lights are not as bright as the DJI battery. I will likely be retiring my two oldest PowerExtra batteries soon and replacing them with another new PowerExtra.
I just retired two of my DJI Spark batteries due to swelling. I sure wish there was third party batteries available for it as the price of Spark batteries has shot up greatly in the last year as they become harder to find.