Battery life on nrf52840 using meshing.

[Robbylaw]

I have developed a ble5 long range and meshing product but my life is way to short. using 2-3.6v batteries in parallel and only getting 2 months life in my battery calculations and I know I should be getting a lot more can anyone help me ? 

Battery Lifetime Report

 

 

For a week

Function	Description	Current consumption	Unit	Duration	Periodic
BLE Radio	GDM Open Alarm	10.8	mA	24 hours	24 * 7 hours
	Close Alarm			280 s
Sleep mode	Wake on GPIOTE input	2.36	uA	Rest

- Battery

3.6V 1.2 Ah * 2

- Current consumption for a week

Sum = 10.8 * (24 + 280 / 3600) + 2.36 / 1000 * ( 24 * 7 – 24 – 280/3600) = 260.38 mAh

- Lifetime

Lifetime = 1200 * 2 / 260.38 * 7 = 64.5 days

 

 

 

Therefore, battery life time is about 2 months

[Marciano-PL]

Unfortunately I think your numbers are realistic. Mesh requires that you have your radio on at all times, which adds up. Mesh isn't really designed for battery operated devices, unless you can have some devices with an unlimited power source nearby. If this is possible for you, consider reading about low power nodes (lpn) and friend nodes.

[Marciano-PL]

I'm not sure exactly what some of your weekly current consumption formula means. If you are running the radio the whole time then
2.4Ah / 10.8mA = 222.22h = 9.25days

[Robbylaw]

Thank you for your reply. When you say meshing not for battery operated devices. My tx is the one with the battery and my rx nodes has unlimited power supply. Does that make a difference? And the tx sleeps when the garage door is closed when Door opens a tilt switch activated the tx which send a signal to the nodes. To better understand my device please have a look garagedoorminder.com