# Thread: Panasonic 3100 mAh voltage vs capacity

1. ## Panasonic 3100 mAh voltage vs capacity

This is the capacity chart that I am using:
4.2V = 100%
3.6V = empty
<3.5V = over-discharged

But, I was told that with the new Panasonic 3100mAh cells, 3.6v cells still have around 40% capacity remaining. What would a new capacity chart, representing 3100 mAh cells look like?

2. ## Re: Panasonic 3100 mAh voltage vs capacity

After reading around for a bit, I've concluded that, for anything using the NCR18650 3100 mAh cell (i.e. AW, Callies, Redilast, Eagletac), voltage below 2.5v would be overdischarged, and ~2.8 volts should be considered empty. So, it would be safe to wait for the cell to drop to 3.2-3.4v before recharging.

Sidenote: I know that it is better to frequently top off cells instead of doing a deep charge on them, but it's nice to know what the cells can be safely run down to.

Source: http://industrial.panasonic.com/www-data/pdf2/ACA4000/ACA4000CE240.pdf
Cutoff stated is 2.5v

"(3) Discharge Termination VoltageNNP series 2.5V per cell (2.75V per cell in the case of 2 series or more)
PSS and Cobalt acid series 3.0V per cell
Avoid discharging at voltages less than these."
http://industrial.panasonic.com/www-...ACA4000PE1.pdf

3. ## Re: Panasonic 3100 mAh voltage vs capacity

Originally Posted by aimxplode
This is the capacity chart that I am using:
4.2V = 100%
3.6V = empty
<3.5V = over-discharged

But, I was told that with the new Panasonic 3100mAh cells, 3.6v cells still have around 40% capacity remaining. What would a new capacity chart, representing 3100 mAh cells look like?
About 1Ah capacity left @ 3.6v. So ~30%. Depending on the discharge current the cells should generally rebound after 10 minutes to about 3.2v+.

The 2.5v is the minimum voltage underload. I would say that about 3.2-3.3v idle voltage is about 0%, but its always better to recharge sooner rather than later...

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