# "Fully Charged" battery only shows 93%?

**URL:** <https://community.particle.io/t/fully-charged-battery-only-shows-93/61165>\
**Category:** Device OS\
**Created:** [September 21, 2021, 4:57pm UTC](https://community.particle.io/t/fully-charged-battery-only-shows-93/61165 "2021-09-21T16:57:39Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![RedHuskies](https://avatars.discourse-cdn.com/v4/letter/r/96bed5/32.png) [@RedHuskies](https://community.particle.io/u/RedHuskies)\
**Post date:** [September 21, 2021, 4:57pm UTC](https://community.particle.io/t/fully-charged-battery-only-shows-93/61165/1 "2021-09-21T16:57:39Z")

</div>

Apologies if this is in another topic (I searched, I swear!) or documented somewhere that I missed.

Using a 500mAh battery with a Boron. I see the yellow light when charging. It goes out when fully charged. However, both looking in the console and calling `System.batteryCharge();` returns 93%. I tried a couple batteries, none show higher (maybe 94%, I don’t remember, but for sure not 100%). Is this normal/expected? Are these batteries I got (direct from manufacturer) not capable of a full charge? It’s not a huge deal for me, but if this is something that other people will eventually use they’re not going to like having batteries that never completely charge (in their eyes).

---

<div class="post-metadata">

**Author:** ![robc](https://avatars.discourse-cdn.com/v4/letter/r/e9a140/32.png) [@robc](https://community.particle.io/u/robc)\
**Post date:** [September 21, 2021, 5:33pm UTC](https://community.particle.io/t/fully-charged-battery-only-shows-93/61165/2 "2021-09-21T17:33:02Z")

</div>

Firmware charges to this level, by default, for safety reasons. Here is a link:

[https://community.particle.io/t/state-of-charge-values/48860/7](https://community.particle.io/t/state-of-charge-values/48860/7)

Here is another link about the PMIC:  
[https://docs.particle.io/cards/firmware/pmic-power-management-ic/pmic-power-management-ic/](https://docs.particle.io/cards/firmware/pmic-power-management-ic/pmic-power-management-ic/)

---

<div class="post-metadata">

**Author:** ![RedHuskies](https://avatars.discourse-cdn.com/v4/letter/r/96bed5/32.png) [@RedHuskies](https://community.particle.io/u/RedHuskies)\
**Post date:** [October 7, 2021, 2:17am UTC](https://community.particle.io/t/fully-charged-battery-only-shows-93/61165/3 "2021-10-07T02:17:36Z")

</div>

Most excellent, thank you! Apologies for not seeing this earlier.