Battery Tender Wireless Battery Monitor 081-0172

It's a great use case: plug this into your battery and any time you want, open an app on your phone and see your battery voltage. It's not that simple, however. The main problem is that this monitor cannot deal with most modern WiFi routers (ones where a single SSID appears on 2.4GHz and 5GHz both). You need to have a very simple WiFi router for this, preferably one from around 2010. Initial setup of the device on an iPhone is clunky because of changes to iOS in recent years (telling the Battery Monitor which SSID to use is very clumsy, as it is with plenty of other IOT devices). Sometimes, my battery monitor just quits refreshing current voltage and then it recovers and I don't know why.