After I played - a lot - with SAM21 and BLE Sense without any issues - and super happy about it - , I bought 17 of those ESP32C3 as it is so much cheaper then the Sense.
Well, the first one was extremely hard to anchor the antenna to, and the two first of the 17 batches are not working on battery while perfectly fine on USB.
That is a big deal and I not sure if I should open more of the 15 left, or if I should send it all back… Pretty disappointing in terms of building quality.
Bought from Seeeduino Germany.
Again I had zero issue with the SAM21 or the BLE Sense.
I guess you get what you pay for.
Too bad the BLE Sense price is going to the roof. Someone should adress the issue and keep the price down I guess the demand is high.