.. include:: /urls.rst

.. _l14_battery_life:

Battery life
============

.. raw:: html

    <video width="80%" controls>
        <source src="https://videos.puri.sm/promo/L14_charging_v3.mp4" type="video/mp4">
        <source src="https://videos.puri.sm/promo/L14_charging_v3.webm" type="video/webm">
        Your browser does not support HTML video.
    </video>

.. seealso::
   * :download:`Download <https://videos.puri.sm/promo/L14_charging_v3.mp4>` the video
   * `Original blog post <blog_l14_battery_life_>`_

The Librem 14 has a powerful 66.8Wh battery.
This provides approximately 9 hours and 48 minutes of battery life with maximum screen brightness and all sensors enabled.
This is the uptime you can expect with light use such as reading a text document or other simple low-CPU applications.

.. image:: /_files/L14/battery/powermon-max-brightness.png
   :scale: 50%
   :alt: Battery monitor: Max brightness, all sensors on
   :class: no-scaled-link

Setting the screen to 50% brightness provides an additional 47 min of battery life.

Here is the timelapse of a 50% brightness discharge test:

.. raw:: html

    <video width="80%" controls>
        <source src="https://videos.puri.sm/promo/L14_half_screen.mp4" type="video/mp4">
        <source src="https://videos.puri.sm/promo/L14_half_screen.webm" type="video/webm">
        Your browser does not support HTML video.
    </video>

.. image:: /_files/L14/battery/powermon-50percent-brightness.png
   :scale: 50%
   :alt: Battery monitor: Include 50% brightness
   :class: no-scaled-link

With Wifi powered off and the screen brightness turned down, you can expect around 16 hours and 17 minutes.

.. image:: /_files/L14/battery/powermon-min-brightness-wlan-off.png
   :scale: 50%
   :alt: Battery monitor: Minimum screen brightness, WLAN off
   :class: no-scaled-link

Playing 1080p 60FPS video lasted 4 hours and 8 minutes from a full charge to automatic shutdown.

.. image:: /_files/L14/battery/vlcsnap-2021-05-10-11h43m18s196.png
   :scale: 50%
   :alt: Playing HD video
   :class: no-scaled-link

The Librem 14 features a lot of computing power in a 14" frame.
While you will not likely need to use all 12 threads at their max frequency, it is useful when doing development work.
The Librem 14 battery lasted 2 hours and 24 minutes with all 12 threads at maximum frequency.

.. image:: /_files/L14/battery/powermon-stress-test.png
   :scale: 50%
   :alt: Battery monitor: CPU stress test
   :class: no-scaled-link

The Librem 14 takes about 4 hours and 40 min to charge from 0% to 90%.
The last 10% takes the longest to complete.

.. image:: /_files/L14/battery/powermon-charge-from-dead.png
   :scale: 50%
   :alt: Battery monitor: Charge 0-100%
   :class: no-scaled-link

With the Librem 14 powered down, you can charge it from 0% to approximately 42% in 2 hours.

For extra convenience, the Librem 14 can be charged with any compatible USB-C charger.
This offers an additional method to keep the battery topped off while away from the main charger.

.. image:: /_files/L14/battery/l14-plug-in-usbc.png
   :scale: 50%
   :alt: Plugging a USB-C charging cable into a Librem 14
   :class: no-scaled-link

Here are the complete test results:

.. image:: /_files/L14/battery/l14-powermon-test-summary.png
   :scale: 50%
   :alt: Plugging a USB-C charging cable into a Librem 14
   :class: no-scaled-link