Well, I can only assume that the setting was saved with the font that the crash gave.
In / data / system / users / 0 / settings_system.xml search look up the value of battery_font.
If there is Anumber-Regular.ttf then change it to fonts / Anumber-Regular.ttf
If you are looking for laziness, you can type in the terminal:
settings put system battery_font fonts / Anumber-Regular.ttf