<p>I wouldn't worry about it. IME if a lipo is going to catch fire, it'll do it when you charge it - and you should always charge as if it's going to go off like a firework anyway.</p>
<p>If there's a problem when you're using it, you'll notice the lack of power output. If it can't supply enough power to fly, you'll throw it out anyway. Generally you get some puffing of the cells too.</p>

CC BY-SA 4.0
2024-01-22T09:24:02.890Z
2024-01-22T09:24:02.890Z
Robin Bennett
<p>I am using a LiPo battery to power a model helicopter.</p>
<p>After my first flight with it i noticed a yellow discoloration around the seam of one of the cells. The battery isn't puffed up.</p>
<p>The voltages for the cells are the following:</p>
<ol>
<li>3.844 V</li>
<li>3.845 V</li>
<li>3.825 V</li>
<li>3.843V</li>
</ol>
<p>Is it still safe to charge and fly this battery?</p>
<p><a href="https://i.sstatic.net/NJkLT.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/NJkLT.jpg" alt="Image of the battery" /></a></p>
<p><strong>EDIT:</strong>
I did charge the battery again and flew it and it worked.
But i would still like to figure out what that stuff is and why it seems to be leaking out.</p>

CC BY-SA 4.0
2024-01-20T23:22:26.320Z
It's a little hard to tell from the photo, but the discoloration looks like it *could* be from light damage to the clear plastic heatshrink around the entire pack.

Does your LiPo charger support monitoring the battery's internal resistance? If so, you can try charging the battery (*maybe at a lower current than usual*) and keeping an eye on the internal resistance figures to see if the affected cell is significantly different from the others.
ifconfig
CC BY-SA 4.0
2024-01-23T16:33:44.050Z
@ifconfig Yes i noticed that too, but the discoloration is definitely on the seam of the cell. My charger sadly doesn't has this feature. As stated in my question the voltage of one cell seems to be a bit off, but my charger shows an equal voltage during charging.
XOHOO
<lipo-batteries><battery-safety><battery-cell>
LiPo battery cell yellow discoloration at seam
XOHOO
# LiPo battery cell yellow discoloration at seam

(Asked by: username_0 on 2024-01-20)

I am using a LiPo battery to power a model helicopter.

After my first flight with it i noticed a yellow discoloration around the seam of one of the cells. The battery isn't puffed up.

The voltages for the cells are the following:

1. 3.844 V
2. 3.845 V
3. 3.825 V
4. 3.843V

Is it still safe to charge and fly this battery?

[![Image of the battery](https://i.sstatic.net/NJkLT.jpg)](https://i.sstatic.net/NJkLT.jpg)

**EDIT:**
I did charge the battery again and flew it and it worked.
But i would still like to figure out what that stuff is and why it seems to be leaking out.

**Tags:** lipo-batteries, battery-safety, battery-cell

> **Comments:**
> **username_1**: It's a little hard to tell from the photo, but the discoloration looks like it *could* be from light damage to the clear plastic heatshrink around the entire pack.  Does your LiPo charger support monitoring the battery's internal resistance? If so, you can try charging the battery (*maybe at a lower current than usual*) and keeping an eye on the internal resistance figures to see if the affected cell is significantly different from the others.  
> **username_0**: @username_1 Yes i noticed that too, but the discoloration is definitely on the seam of the cell. My charger sadly doesn't has this feature. As stated in my question the voltage of one cell seems to be a bit off, but my charger shows an equal voltage during charging.  

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## 1 answers

### Answer by username_2 on 2024-01-22. Score: 0 | Accepted answer

I wouldn't worry about it. IME if a lipo is going to catch fire, it'll do it when you charge it - and you should always charge as if it's going to go off like a firework anyway.

If there's a problem when you're using it, you'll notice the lack of power output. If it can't supply enough power to fly, you'll throw it out anyway. Generally you get some puffing of the cells too.


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