balancing questions

Hi,
I am a new guy to the lipoly field.
I have notice that after the balancing process is done,several minutes later the cells are not held within the same voltage.
The cells have different voltages shown in the charger several minutes later after the balancing charging is done.
I thought the cells are advertised as matched cells ,and these situations should not happed.
How about your lipo cells? Does these happen to you?
My charger is Hyperion Duo and battery is trakpower.

are you using the trakpower balancer

No, I am using the built-in balancer of DUO for Trakpower.

[BrianG]

What do you mean by "different voltages"? Differences of 0.01-0.03 aren't bad. Are you using a voltmeter to measure each cell? There might be tiny tolerance differences in the balancer circuit that can be causing this.

Sorry. I did not make it clear.
The balancer in the charger shows the voltage of each cell. I can tell the individual voltage on the screen and a "voltage gap" reading of the charger clearly tells me the voltage difference.

Originally Posted by Gallagher

Sorry. I did not make it clear.
The balancer in the charger shows the voltage of each cell. I can tell the individual voltage on the screen and a "voltage gap" reading of the charger clearly tells me the voltage difference.

if the differences are in the thousands of a volt I wouldnt worry about....things wont be that precise for a $250 charger

[BrianG]

Yeah, there could be slight calibration tolerance differences between the measurement circuit of each cell. The only way to be sure would be to use a voltmeter on each cell. Even so, differences that slight are not an issue at all.

Thanks I got it. I originally thought it is the inherent nature of cells. They only are only balanced at the moment which the balancing process is done. Once the cells are off-line and the open voltage is at its own will.

[Sammus]

The hyperion chargers will read a higher voltage on screen than the actual cell is - I exchanged a few emails with a tech guy over there and it's got to do with how the charger works, and the screen is showing the adjusted voltage inside the charger instead of the actual cell voltage. This was fixed with firmware 1.5, you should download it and update your charger - it has a few other useful/important updates in it.

Thank you, Sammus. I have been using firmware 1.5 already. Don't you have this situation with your v1.5 DOU?

[Sammus]

I think the charger only keeps them balanced to within 0.005V or something.. which I understand is more than adequate. They all read the same voltage to 2dp for me. It could be a pack/cell related thing, I have some batteries with shot cells that fall out of balance very quickly.