With Cyanogenmod 13 the BatteryBar function is broken (at least on "serranoltexx" and official CM 13 nightly). BatteryBar is working with NavBar option, but not with StatusBar option.
When trying to activate BatteryBar with StatusBar, XuiMod did not show the BatteryBar. :(
Thanks to XuiMod is OpenSource it is easy to fix this:
1.) locate file: BatteryBarMod.java
2a.) locate line: final Class<?> phoneStatusBar = XposedHelpers.findClass("com.android.systemui.statusbar.phone.PhoneStatusBarView", lpp.classLoader);
replace the line with: final Class<?> phoneStatusBar = XposedHelpers.findClass("com.android.systemui.statusbar.phone.StatusBarWindowView", lpp.classLoader);
OR
2b) take the line below which states: XposedBridge.hookAllMethods(phoneStatusBar, "onAttachedToWindow", hook);
replace it with: XposedBridge.hookAllMethods(phoneStatusBar, "onFinishInflate", hook);
You have to choose only one of the two solutions (2a OR 2b).
I do not know which is the better one.
compile and install ;)