# Prearm: Battery 1 low capacity failsafe

**URL:** <https://discuss.bluerobotics.com/t/prearm-battery-1-low-capacity-failsafe/9112>\
**Category:** ArduSub\
**Tags:** ardusub\
**Created:** [February 19, 2021, 10:57am UTC](https://discuss.bluerobotics.com/t/prearm-battery-1-low-capacity-failsafe/9112 "2021-02-19T10:57:17Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![ROVST](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@ROVST](https://discuss.bluerobotics.com/u/ROVST)\
**Post date:** [February 19, 2021, 10:57am UTC](https://discuss.bluerobotics.com/t/prearm-battery-1-low-capacity-failsafe/9112/1 "2021-02-19T10:57:17Z")

</div>

Hello guys!

Have any of you experienced “Prearm: Battery 1 low capacity failsafe” problem?

What is the fix?

The battery is definitely ok, tried to reboot all pc’s, re-connect or swap batteries. No changes.

Thank you for support in advance.

 ![prearm](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/d/d6da9dec01bfa2e2c455cc6af76670d24ee43727.png) ![prearm1](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/9/9f34605f482cd19a03c38f81dd091f53fe0cf7a0.png)

---

<div class="post-metadata">

**Author:** ![williangalvani](https://avatars.discourse-cdn.com/v4/letter/w/6f9a4e/32.png) [@williangalvani](https://discuss.bluerobotics.com/u/williangalvani)\
**Post date:** [February 19, 2021, 1:18pm UTC](https://discuss.bluerobotics.com/t/prearm-battery-1-low-capacity-failsafe/9112/2 "2021-02-19T13:18:27Z")

</div>

Hello,

Can you check what your BATT\_ARM\_MAH and BATT\_LOW\_MAH parameters are set to?

---

<div class="post-metadata">

**Author:** ![ROVST](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@ROVST](https://discuss.bluerobotics.com/u/ROVST)\
**Post date:** [February 19, 2021, 3:02pm UTC](https://discuss.bluerobotics.com/t/prearm-battery-1-low-capacity-failsafe/9112/3 "2021-02-19T15:02:58Z")

</div>

I updated QGC to version 4.1.1 and it worked. thank

---

<div class="post-metadata">

**Author:** ![patrickelectric](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/patrickelectric/32/2162_2.png) [@patrickelectric](https://discuss.bluerobotics.com/u/patrickelectric)\
**Post date:** [February 23, 2021, 11:06am UTC](https://discuss.bluerobotics.com/t/prearm-battery-1-low-capacity-failsafe/9112/4 "2021-02-23T11:06:26Z")

</div>