battery level in sdk12.1.0

[mani]

Hi team,

iam using sdk 12.1.0 (ble_app_beacon) I want to advertise the battery percentage.Right now iam using the nrf dongle(it doesn't have cell coin battery) and flashing the ble_app_beacon.does it advertise the battery percentage?? if it capable, where can i view the battery level.or is there any app or sdk to advertise battery level with uuid and it's information.please send me the information if possible,thanks in advance.

[AmbystomaLabs]

I also recommend you include the ambient temp in your percentage calculations. You will notice on the battery curves a strong temp dependence on nominal voltage. If you are just doing some occasional work with the processor (for example sending out beacons) you can safely use the processor temp as ambient. My tests have shown it to be always within 2C of ambient when just sending out beacons every second. And be aware of when you are measuring the voltage. Button cells have high internal resistance and odd chemistry. After bouts of processor activity they will show low by several hundred millivolts for a few minutes. For this reason I never measure battery voltage immediately after boot, radio activity or LED activity.