It may come as a shock to some, but most electric vehicles have 12-volt starter batteries just like traditional cars. Similarly, they can be jumpstarted if they run down and get you up and running again.
This 1000 amp jumpstarter from NoCo can not only supply all the power you needed for a bad 12-volt battery, but can also charge your portable devices. It also features a 100-lumen flashlight with seven modes. Not much bigger than your phone, it's a steal on Amazon right now for $79.95