Some use a magnetic USB connection. I use them on scanners but not a big fan of them on scopes. You bump them and don't realize it and it either powers off, or switches to internal battery and before you know it, you just drained your internals. I use a 90° connector and don't unplug it from the scope, but leave it in and disconnect at the battery. This way you aren't putting stress or causing a lot of wear on the port.
As for the extended battery compartment, Bering has always been a little hesitant about internal rechargeables. This is due to the there isn't a lot of oversight to quality, and then add cheap chargers that overcharge the battery, and then add gun recoil with a battery inside a very expensive thermal. Batteries leaking, overheating, or catching on fire is a real danger. I can tell you one dealer has sold one batch of these extended housing and Bering is watching and will make a decision to carry this or not hopefully in the next few months. I don't believe Bering will be fulfilling any new orders at this time. What I don't like is dealer was recommending using non-protected batteries. In my mind, this is a recipe for disaster. Bering sent me the same extended battery compartment and I have been using protected 16650 batteries. The reason some say to use the non-protected is some protected ones are too long and don't fit. However, there are some protected 16550s that I have found that do fit. More to come on this in the future. You can always PM me if you haven't heard anything about this in a few months.