@SiMoS-IoT Thanks. Given the state of Pycom documentation and the large quantities we are going to need we have decided to build our own solution, so the power feed issue will go away. I really like the approach to power Pycom have, but the fact we can't get any documentation on how it functions, other than a few system calls, means we can't take it into production. I'll probably still keep using it, but only for interests sake.

@robert-hh said in Li-ion battery discharge: bq24040 All of our boards use the same bq24040 circuit, therefore it is recommended to use batteries with a PCM to protect the battery from over discharge

@seb I tried, but still to no avail.

I am using the expansion board 2.0. I have no deep sleep shield yet (Pycom forgot to send the deep sleep shield with the order of the lopy 2 weeks ago. They told me a deep sleep shield is on its way now) We deinit the WLAN from start because we don't use it. We charge just using the micro-usb cable. It is configured with the jumpers at 450mA charge current. In the battery test we did, we intentionally drained the battery fully to see how long it would last. We expected the LoPy to stop working eventually, but expected we would be able to recharge it using the USB connection at that point. Can the deep sleep shield -if used on the LoPy 1- recharge a drained battery by just plugging the USB-cable in after the battery was exhausted and shut off by the deep sleep shield?

@martinnn said in Pysense charging current: @peterb If you look at the PCB, from pin 2 (ISET) of the charger a trace goes directly to a 0402 resistor (which is connected to GND), measuring 1.2 kOhm. Looks pretty obvious to me. Probably difficult to see without microscope though. Thanks! I will find a mircroscope.

@livius I think you're right about the damage - my solar panel produced 7v and fried my expansion board.