Scale

I told you I use an EOS Sentry I bought from Heli Pro's.
If I discharge to 20% of an 1800 mah pack that mathematically figuires to be 360 mahs. I when I use my "worthless charger". I use a timer to keep track of the mahs going back into the pack at a mah setting on the charger. Example, set charger at .5 mah or 500 mah. That means in one hour the charger will charge 500 mahs. I keep track of the minutes until the charger peaks and that tells me how many mahs I put back into the pack.
Sounds complicated, but it isn't. Just use the math from school.

Kirby

I want to see it for sure.

Darrolair

So all you are figuring is 20% of what the pack is supposed to be based on it's Voltage,, you still have no way of knowing what the packs true capacity is. That X% it's showing is only based on a formula of the range of voltage for said pack. That's why the percentage will change when you switch chemistry settings. At best it's a guesstimation, both my chargers have a similar feature and they are never display the same %.

You will only know the true capacity if you cycle the pack.

and you miss quoted me,, I said "It's useless for evaluation of a packs condition",, not worthless

good luck, Scale out

No, iput *** in saltwater for a whileand then threw it away.


Left it plugged in on my ignition module in a 100cc gasser overnight, because i didn't know it still drained like .2 of an amp when thew switch was in the off position

Ah yes, I too have ruined a pack or two in my day..

Scale

My charger won't tell me the condition of my packs. However, by doing the math and discharging to 20% will. It's not brain surgery!!!
So when my EOS Sentry tells me 90% and is reading 6.6 volts, 40% and is reading 6.6 volts, it's the volts giving the percentage reading? Humm.

Good luck......

LiFe batteries have a VERY flat discharge curve and it is not typically possible to read their percentage of discharge via your standard voltmeter reading like can be done on a good NiMH or NiCad... I wonder if this EOS Sentry reads the voltage down to the 1/1000th or 1/10000th of a volt  where the discharge could semi-accurately be read..

You would need something along the lines of a Keithley Instruments nano voltmeter to get good readings.
At that point you have to be taking measurements in a controlled environment lab to get any good solid data.

The only way I know of to keep tabs on a packs condition is how fast it drop off with a give load.
As the pack gets older the curve becomes more of a slope, much along the lines of a laptop battery...