eufy HomeVac S11 - Spare Battery Storage ???

We just got a eufy S11 Infinity, looking for a place to mount the accessories mount, and realized there is no where for the spare battery to go. When hanging the vacuum in the mount, it’s made to fit the vacuum with a (one) battery attached to it, there are plastic clips that allow you to hang all the vacuum attachments, just not the extra battery.

Wondering if anyone has figured out any kind of workaround, or another way to hang the extra battery out of the way. Someone in an Amazon review built one, but the picture is too small to figure out how they did it. Suggestions welcome!