pietervannuffel:
Still running fine. I use this battery.
How did you connected it, on provided battery input pins or VIN? With some kind of voltage regulation or direct? And do you recharge them while MKR is working?
I ordered today Panasonic 3.7V 3400mAh Lithium Ion Rechargeable Unprotected Battery:
https://www.amazon.de
with some power shield / holder with protection and regulated outputs:
https://www.amazon.de