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.

[Sigurd]

Q1: So if I am not wrong both TX power of the NRF52 and beacon kit can be change by the user easily?

A1: Yes, that is correct. You can use the function sd_ble_gap_tx_power_set to set the TX-power.

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Q2: Please also tell me what is the TX power of the NRF52 when is connected to other device, when it is just advertising and when it is in the scanning mode?

A2: The default TX-power is 0 dBm. If you want to advertise or connect to other devices using a different TX-power use the function sd_ble_gap_tx_power_set() after you enable the SoftDevice.

[Usman Rashid]

The default TX power of the beacon is also 0 dBm ????

[Sigurd]

Yes, the default TX-power in the BLE examples in the SDK is 0 dBm.

[Nakul Nair]

I want to broadcast every 1 min so how to calculate battery life for that..the max value in the online power profiler is 10240 ms

[Sigurd]

Hi Nakul93,

The BLE specification does not allow the advertising interval to be larger than 10.24 s.

From the BLUETOOTH SPECIFICATION Version 4.2 [Vol 6, Part B]:

The advInterval shall be an integer multiple of 0.625 ms in the range of 20 ms
to 10.24 s. If the advertising event type is either a scannable undirected event
type or a non-connectable undirected event type, the advInterval shall not be
less than 100 ms. If the advertising event type is a connectable undirected
event type or connectable directed event type used in a low duty cycle mode,
the advInterval can be 20 ms or greater.