Power Cycling Franklin T9 Hotspot

We use a Franklin T9 hotspot as well for an extended use situation in a vending machine. We encountered after a certain period (~2-3 weeks) where the screen on the hotspot gave us the message "For extended use please remove the battery." This makes sense because in some other devices we've experienced, when it's charging and powered on constantly with the battery installed, over time this may put the battery at risk of swelling and rupturing. (Note: we have NOT had this experience with our Franklin T9, but it has happened to us with an AT&T hotspot and an iPhone 6s before.) Seems like a nice safety feature they added to have this.

HOWEVER, we did remove the battery and the unit was working great for a period with no battery, just plugged in via the usb charger. I can't say specifically how long this period was but it was less than 2 weeks before the unit stopped broadcasting a signal and we received a message on the hotspot unit stating "Charged too long please disconnect the charger." Alas, I don't know if there's a way to use these in an "extended use" scenario, but perhaps someone at T-mobile can help?

I also thought of the idea to have the outlet that the unit is plugged into essentially power cycle itself daily, so that the device would restart itself daily and not run into this problem. However, the device does not auto-startup upon losing power, the button has to be manually pushed in order to fire up and begin broadcasting a signal. Maybe there is a setting to change this auto-start, but I've yet to find it.

Sorry I couldn't solve your problem but figured I'd share my struggles and hopefully we'll resolve some day. Cheers.