Battery life on nrf52840 using meshing.

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

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