There are more and more lithium batteries being installed in camper vans (and other places), many of them equipped with Bluetooth BMS (Battery Management Systems) and a smartphone app to let you see the status of your battery.
I didn't want to have to check my phone every time I need to see how charged the leisure battery in my camper is, I wanted a physical meter in the van that I can glance at - so I built this.
After sharing a photo of it on a VW group on Facebook, loads of people wanted one - so I'm working towards developing it further into a real product. If you're interested, please sign up below and I'll send you updates.