You may want to purchase a front kiddie bar to support the full weight of the battery bag. This bag can work with any e-scooter, not only ZERO scooters. Add extra form to the battery for extra padding.
Here is the installation process for the external battery:
Alternatively, for Fiido and scooter bags you can also use our ZERO Battery bags. They can fit into the space between the saddle and the handlebar like below: