I’ve seen those cheap batteries. On the picture it says Tello on the battery. That is not original. the tello comes with a fullymax battery. It doesn’t have tello’s name on it and im not putting that in my tello . Still trying to figure out the best charge time on those chargers, i only have 2 spare batteries
I’ve bought my tello for my simple professional projects (simple video and motion projects), and some fun. I don’t want to spend a lot of money because, if I start to be more “pro”, I spend money in a “really” drone... so, cheap battery’s could be a waste of money... or not... lol
Few months ago I bought two spare batteries from Aliexpres. Original for about 35 together. For 3 the price is better. They came in unopened orange original blisters, Fullymax brand and last about 10-11 minutes. I would not try to save few bucks on alternative brands.