I have 2 DJI battery’s and 2 knock offs. I can tell a difference in how the feel, how they seat in to battery holder, and how the fit. All not for the better. To date I had to make one emergency oh **** landing because one of knock off started to loose connection but had enough to keep flying drone. This happen directly after take off and I wasn’t to far. 2 other times where it caught the issue before flight. I have more that 20-30 flights with each of them. I just try to use them when I’m fly in rural areas and not in town lol. As for performance I can’t tell a difference.Buying new Aftermarket batteries for a P2 Vis+ that's been in mothballs for three years. Anyone have any advice/warnings before I try to re-learn it all?