OBD dongle
Look inside your EV
There's a lot going on inside your EV. If the battery isn't warm enough (or if it's too hot) then charge rates will slow down. Wouldn't it also be good to find out your battery health?
See it on Amazon UK
See it on Amazon USA
See it on Amazon Germany/EU
By plugging one of these into your OBD port, you can find out a whole manner of different things. If you want to find out information about your EV, you can link the dongle to Car Scanner (iOS, Android) and for on-the-go route planning, A Better Route Planner (iOS, Android). The dongle I've been using for years is the LElink, but I've heard that no longer works with ABRP (unless you have a Leaf) so I'm now linking to another called Vgate iCar Pro. If you have a Leaf, the LElink is still your best bet though as it's one of the few that works with Leaf Spy (iOS, Android). LElink dongle: amazon.co.uk, amazon.com
These are affiliate links so I'll get a little money if you buy using them. Thank you!