DK Li-Po battery

[Roger]

Dear All,

I would like to order Li-Po batteries for my nRF52840 development kits and need some information. From the battery, what type of female battery connector is needed to plug into the board?

Kind regards,

Roger

[Roger]

I connected an external battery to Li-Po connector and switched SW9 to Li-Po position with SW6 to default. The battery potential is 4.2V when fully charged. I noticed the leds on the DK appears much more dimmer (barely visible) compared to when supplied by the coin cell battery (3V) or the USB supply (5V). Just a bit strange, is this normal?

I read that in the Li-Po position, the high voltage regulator of the SoC is directly supplied by the Li-Po battery and that the VDD voltage can be set by firmware? Please see this link on page 20.

[AmbystomaLabs]

The RF core is only 1.3V. 1.8V is well above its spec. Plus the brown out reset keeps the nRF from operating if VDD is too low.