battery life estimate

[Ridhi]

i have nrf52832 using nrf sdk version_17 and s132.

I have application for logging

i have followed steps:

1). intially device in sleep mode

current: 0.35 micro Amp

2). press button for 5 sec and then device advertises for 30 secs: 

current: 84.29 micro Amp

3). connect on nrf connect app for mobile

displays services and characteristics 

current: 740.40 micro Amp

4). chip erase 5 secs: 14.81 mA

5). takes about 100 logs in interval of 2 secs

each log: 7.03mA 

amidst logs: 2.11 micro Amp

so total 100 logs almost take 3min 22 secs and current: 1.57mA

6). disconnect and then advertise and connect and notify enable to get data: 

data log getting current: 741.20 micro Amp for 52 seconds

I am using coin cell battery CR2450 LITHIUM 3V

attaching power profiler trace.

pls help to calculate the life of device

[Karl Ylvisaker]

Hello,

It seems you did not include any power profiler trace. Either way, to estimate the battery life of your device you will need to measure the average power draw and duration of the operations that the device will wake up to execute, in addition to calculating the sleep current.
In essence, create an estimate for the total average power draw of your device.
Then, you check this average power draw against the typical capacity for the battery you have chosen - this will be listed in the specific battery's datasheet.

Best regards,
Karl

[Ridhi]

karl i am not able to attach the trace of ppk .i am using insert option but it is not helping

[Ridhi]

gentle reminder Karl i have to calculate it at earliest can i email you the trace or some other way pls

[Karl Ylvisaker]

You must use the Insert -> File option to share a file here on DevZone.

What is the average power draw and duration for the full time that the device is awake?
And what is the average power draw and duration for the time that the device is asleep?

Best regards,
Karl

[Ridhi]

ppk trace is 1.77MB when i am using Insert -> File option  i am not able to upload it

[Karl Ylvisaker]

That is strange - I have had no problem with this in the past, and I tested this just now on my end by uploading an entire SDK as a .zip file without issues.
Are you getting any error messages or warnings when you do this? Does the upload being after you have selected the file?

Either way, I do not think you will need to upload the trace to make this estimate, since I would need to know a lot more about the regular operation of the device before I would be able to make any estimates myself.

Therefore, I suggest that you make the estimates as described earlier and compare them with the capacity of the specific battery you intend to use, to estimate the battery life of your device.

Best regards,
Karl