Did you replace all the silicone you removed from the connections? If not that’s your problem. The connections will not stay in place without the silicone. You should also have put a little thermal paste on the board BEFORE replacing the bottom...
Yes, many batteries are made in China but they are not all made to the same standards. While I’ve not heard of any house fires caused by drone batteries, in the UK lives have been lost from fires caused by poor quality electric scooter and bike...
It’s fine as long as you don’t plan on using your DJI warranty while the drone is still covered.
As for the third party batteries you're considering, it's hard to say how they'll perform compared to DJI's. I wouldn't assume all batteries from...
The website looks legit, and the delivery time is much better than Alli Express. Please let us know how this order goes. If the battery arrives when promised and lives up to the specs, I will be tempted to try this new alternative to Ali...