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Battery life calculation

Sayali Shinde
Intellectual 705 points


Hello Team,

     we are using lithium ion battery in application . Battery rating is 3.3V with 225mAh rating. our application consume 3mA current .

As per theoretical calculation the battery life will 225/3= 52.5 hours. we want to practically verified this life span.

we tired to connect 2ohm resistor across to discharge in 13 min but its didn't happen.

can you suggest how can we verify battery life .

Regards,

Sayali 

  • 0
    TI__Guru** 105810 points

    Hello Sayali,

    Can you clarify your question? Which gauge are you using to estimate the capacity? If you are looking for general guidance on gauging I would recommend looking through our application notes, here's one on impedance track: https://www.ti.com/lit/an/slua364b/slua364b.pdf

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 705 points

    Hello Wyatt,

              we are using lithium ion coin battery of 3V with 225mAh capacity. our circuit require 3mA current . theoretical calculation gives that battery will work for 52.5hours . we cannot keep our device working for long 52 hours. we though we will use small value resistor of o.5ohm so that it draw more current and drain fast. we keep connected 0.5 ohm resistor of 300W for 20 to 30 min ,during testing the voltage drop from 3V to 0.12V ,but after the test we check voltage it shoes 2.9V , due to the test the charging capacity may got reduce but we are unable to calculate exact working hour.

    can you guide us how can we check battery life of coin type. Hope I have clarify the question.

    Regards,

    Sayali

  • 0 in reply to Sayali Shinde
    TI__Guru** 105810 points

    Hello Sayali,

    I'm not sure what you are using to use to gauge the battery capacity, MCU, gauge, etc. We can assist you in setting up a TI battery gauge to determine the battery capacity, but for setting up your own gauge with a MCU we cannot assist you. You can use our application notes to help you understand the methods used for battery gauges to help setup your system.

    Sincerely,.

    Wyatt Keller