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Oct 31, 2010, 01:17 PM
Registered User
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Discussion

Charts that show "Resting Voltage vs Capacity Remaining" for LiPO's?


Hi guys,

I asked this question once before about a year ago, but can't find that post.

Anybody have a link to those charts that show LiPO resting voltage, (for 1S, 2S, 3S, etc. batteries) vs capacity remaining?

I have an old and tattered 3S chart, and I need to replace it.

This chart's X axis is voltage from 10.9 to 12.2. Y axis is per cent remaining, from 0 up to 85, and there is a diagonal red line that shows the relationship, i.e., 11.6 = 50%.
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Oct 31, 2010, 03:13 PM
Space Coast USA
hoppy's Avatar
See post#2
"How Much Capacity is Left in my Pack"
https://www.rcgroups.com/forums/show....php?t=1287041
Nov 02, 2010, 04:18 PM
That's a funny word
2 more charts.

100.00% 4.2 8.4
90 4.13 8.26
80 4.06 8.12
70 3.99 7.98
60 3.92 7.84
50 3.85 7.7
40 3.78 7.56
30 3.71 7.42
20 3.64 7.28
10 3.57 7.14
0.00% 3.5 7


3.7=0%
3.8=20
3.9=40
4.0=60
4.1=80
4.2=100%
Nov 02, 2010, 08:56 PM
Registered User
Thread OP
Thanks very much Hoppy and Gulio!

The chart I have is a graph, it's gray and has a red diagonal line from lower left to upper right. It's the dangest thing, but i can't find my post, somewhere in the past, that asked for it, and I can't find any thread that shows it. I'm stumped. I have the printed graph right here, so I know I didn't imagine it. It's a handy graph, for 3S, which is what I fly almost entirely, and there was also one for 4S, 5S, etc., as I remember.

It's tattered because I use it all the time; take it out and look at it when I check my batts to see whether I can fly some more on that battery.

But it has the same info as you have supplied, so maybe I'll just print this out and use it.

Thanks again!
Nov 02, 2010, 09:10 PM
Space Coast USA
hoppy's Avatar
Or draw a graph from the data.
Nov 02, 2010, 09:12 PM
Registered User
Thread OP
Hoppy,

Yep, you bet. I do know how to do that in Excel, now that you mention it!
Jan 26, 2018, 04:24 PM
Quadaholic
--Oz--'s Avatar
...
Jan 26, 2018, 04:42 PM
Space Coast USA
hoppy's Avatar
Oz, that was 8 years ago. On the other hand, maybe his 8yr old chart needs replacing.

(Not like I haven't answered very old posts. LOL)
May 13, 2018, 04:53 PM
AMA 112851
tommyt's Avatar
Why are there different stats for the chart in post 7 and the data in the two examples in post 3?
May 13, 2018, 06:36 PM
Space Coast USA
hoppy's Avatar
Voltage vs Capacity measurements have some variables but in general are good enough for modeler usage. The battery chemistry, age, use all affect the reading. My chart was based on a variety of packs, different brands, age, etc. Other charts may be from all new packs, same brand, etc. Some charts are made using discharge mah, others from charge mah. Expect some differences but none that would make them unusable.
May 14, 2018, 09:17 AM
Registered User
I have used the curves to make a crude State of Charge readout and for me it's good enough. Measuring consumption is somewhat difficult and prone to errors so I rely on voltage to give me rough SOC on my Lithium powered golf cart.


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