anarchosax I don't know. If I were you I'd install the package again and see if the problem is repeatable. If it is, it needs to be reported to the package maintainer.
Well, I installed it and it didn't do any such thing to me. But I don't have xfce4 installed, I may try that.. I installed xfce4. Frankly it doesn't work. It just displays "—". I assume it gets its information from acpi or some other resource that my Pinebook Pro doesn't have. But it didn't affect me starting X. I was even able to start two different X sessions at the same time 🙂
Also note that sysutils/xbattbar is a pretty good choice. It works no matter what wm you use (or even if you don't use one!)