I was able to look into hybrid vehicles. These vehicles do report the percentage battery remaining. And for those you will be able to create custom rules and reports. Unfortunately, there are no specialized reports yet. Please do visit the Geotab marketplace. You can definitely customize one of the reports to suit your needs.
As for fully electric vehicles, we have limited data on them. It is in the Geotab roadmap to support EVs. Do you have a device currently in an EV? We can take a deeper look and see what other information we can get.