Could you say a little more about how you plan to use BTLE and which units you’re using? I set one of these up last month and it’s generally great, but yeah wifi is a hog. It never occurred to me that something with BTLE would make such a difference.

It’s a great form factor though, isn’t it? Kicked off a bit of an e-ink / esp32 boom for me. I just bought 4 integrated 4-inch displays to complement this 7.5.

OpenDisplay's calculator is what I'm basing it off: https://opendisplay.org/firmware/battery/index.html

My first EN05 board had a problem with the battery and I just got the replacement a few days ago and haven't had time set it up or do long-term tests. I also was blown away by the WiFi vs BTLE power usage. I love ESP32 but for battery powered I'm looking closer at BTLE. I actually have 3 ESP32's around the house to act as BTLE proxies for Home Assistant which I can use with OpenDisplay as well.

And yes, it's a great form factor, it looks great, and just makes me smile when I walk by one. Once I can solve the "more updates, less recharging" I plan to frame a number of these to hang on the wall.