Battery life calculation for NRF52 and NRF51(Beacon kit)

[Usman Rashid]

Hi,

Is there any battery life calculations for NRF52 and NRF51 (Beacon)?

For example: if TX power of NRF52 is 0 dBm and it broadcast every 5 seconds ? Or with any other random settings.

[Nakul Nair]

Hi Sigurd,

My advertising interval is set for 150 msecs and advertise for 3 secs using a timer and when the timer expires I stop advertising using sd_ble_gap_adv_stop function, I then go in idle state for 1 min using another timer and the above cycle repeats. 

I have successfully achieved this, my only query here is what will be my battery life, I am using CR2032 coin cell.

[Sigurd]

Hi Nakul Nair,

Let's say you are using around 1.9 µA in sleep(RTC timer running). And with the online profiler, we get around 77µA average during the 3 second advertising with 15 byte payload and intveral set to 150ms. This gives us around 5.5 µA average for the 63 second cycle. Using the forumula in the originally answer in this post, this gives us around 3.2 years battery life, that is including the 0.7 factor accounting for external factors which can affect battery life.

[Madhav Aggarwal]

Hello, is there any way to calculate the CR2032's life practically without waiting for actual 4.18 years as we are also using NRF52 as beacon in our product and want to assure our customers that it will last atleast the theoretical time? 

[Sigurd]

I would recommend that you measure the current consumption on your custom device. For this I would recommend the Nordic PPK.

[zeal]

Hi,

nRF52811 is not provided in the choices of online power profiler, may I know where can I set and check the power consumption of it?