How Do i test capacity with bt-c3100

Mikel Sandoval

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So All my batteries are fully charged. I left them in a box for weeks and they all seam good, most only discharged like .01-.03v so I guess thats OK for me.

But when I do charge test they display 6600mah when specs display 2200mah
samsung icr18650-22f

Can someone explain how to use this charger to display the capacity, I did charge test and discarded at constant 1000ma
 
All testing is done during discharge. Run the charge-test instead.

It will Charge - discharge and test capacity - charge up again
and then you get the real capacity. But if you get 6Ah during charge they are most likely also dead warm and self discharging
 
daromer said:
All testing is done during discharge. Run the charge-test instead.

It will Charge - discharge and test capacity - charge up again
and then you get the real capacity. But if you get 6Ah during charge they are most likely also dead warm and self discharging

You mentioned Charge Test can at 1000mAh and that is correct. 6000mAh is wrong.. i suggest you try Discharge at 1000mAh and see what results are.
 
hermitdave said:
You mentioned Charge Test can at 1000mAh and that is correct. 6000mAh is wrong.. i suggest you try Discharge at 1000mAh and see what results are.

You test with "A" or "mA", not "mAh"
Capacity is rated as "Ah" or "mAh".

+1 with daromer. Testing during charge can give you much higher results than the real amount due to the cell heating up during charge. The charger has no way of knowing that the energy it's trying to give to the cell is being changed to heat. There is a temperature probe, but that only tells it to stop if things get to hot. It has no bearing on the results directly.

If you're getting a 0.01V - 0.03V drop after resting a few days, I'm wondering if you have a bad connection. Usually those cells should drop voltage a bit faster than that. Or you have a defective charger
 
Let me clear things up, I did charge test with batteries full capacity.
So its charge test at 1000mA
but when it was done it said 6600mAh(capacity)

Im currenty charging batteries again to make them max again. So this time do charge test at 1000mA again


Korishan said:
hermitdave said:
You mentioned Charge Test can at 1000mAh and that is correct. 6000mAh is wrong.. i suggest you try Discharge at 1000mAh and see what results are.

You test with "A" or "mA", not "mAh"
Capacity is rated as "Ah" or "mAh".

+1 with daromer. Testing during charge can give you much higher results than the real amount due to the cell heating up during charge. The charger has no way of knowing that the energy it's trying to give to the cell is being changed to heat. There is a temperature probe, but that only tells it to stop if things get to hot. It has no bearing on the results directly.

If you're getting a 0.01V - 0.03V drop after resting a few days, I'm wondering if you have a bad connection. Usually those cells should drop voltage a bit faster than that. Or you have a defective charger
I use multimetter to read the charge not the charger, I also thought good cells stay charged


daromer said:
All testing is done during discharge. Run the charge-test instead.

It will Charge - discharge and test capacity - charge up again
and then you get the real capacity. But if you get 6Ah during charge they are most likely also dead warm and self discharging
What do you mean bydeadwarm and self discharging
 
What daromer meant from "dead warm" and "self discharging" is that during some tests, the cells would get very warm, or even hot. I mentioned this in my previous comment. Self discharging is exactly what it states. The cell will slowly loose voltage over time.

I think part of what is a bit of misunderstanding is, are you testing during Charge, or during Discharge? If during Charge, then it's possible the cells are heating up and the opus doesn't know this. If you are Discharge testing, then there is something else going on.

But one thing to note, it's impossible to have a 6600mAh cell in an 18650 form factor. Not with our current technology, anyways. Well, maybe aliens have visited :p
 
Korishan said:
What daromer meant from "dead warm" and "self discharging" is that during some tests, the cells would get very warm, or even hot. I mentioned this in my previous comment. Self discharging is exactly what it states. The cell will slowly loose voltage over time.
So its normal for a cell to lose some voltage over time?
And most my cells are fine during charging, I had a couple heat up and some even died after charging. I tested 2 cells that were charged few weeks ago and they had no voltage



Korishan said:
I think part of what is a bit of misunderstanding is, are you testing during Charge, or during Discharge? If during Charge, then it's possible the cells are heating up and the opus doesn't know this. If you are Discharge testing, then there is something else going on.
I did charge, for max

now I charge test @ 1000mA seting

I got was 6600mAh

But im doing it again, to see if i did it wrong or something.

How long should a charge test take?


Currently it says discharge

test

last thing, what voltage does this bring it down to till it gets a reading
 
MikelSandoval said:
Korishan said:
What daromer meant from "dead warm" and "self discharging" is that during some tests, the cells would get very warm, or even hot. I mentioned this in my previous comment. Self discharging is exactly what it states. The cell will slowly loose voltage over time.
So its normal for a cell to lose some voltage over time?
And most my cells are fine during charging, I had a couple heat up and some even died after charging. I tested 2 cells that were charged few weeks ago and they had no voltage



Korishan said:
I think part of what is a bit of misunderstanding is, are you testing during Charge, or during Discharge? If during Charge, then it's possible the cells are heating up and the opus doesn't know this. If you are Discharge testing, then there is something else going on.
I did charge, for max

now I charge test @ 1000mA seting

I got was 6600mAh

But im doing it again, to see if i did it wrong or something.

How long should a charge test take?


Currently it says discharge

test

last thing, what voltage does this bring it down to till it gets a reading

Discharge part should be around 3 hours.

I think i had one of those cells Daromer mentioned. The initial boost charge was still on street 5.5 hours.

Thanks for correction Korishan.. yes discharge rate not including duration. Duration makes it capacity. Oops
 
hermitdave said:
Discharge part should be around 3 hours.

I think i had one of those cells Daromer mentioned. The initial boost charge was still on street 5.5 hours.

Thanks for correction Korishan.. yes discharge rate not including duration. Duration makes it capacity. Oops
Its been 5:45 on the timer (5hr 45m)
and its at 3.38 voltage
why is it dropping soo low
I heard 3.5v is the lowest safe voltage

I bought the charger new
 
MikelSandoval said:
hermitdave said:
Discharge part should be around 3 hours.

I think i had one of those cells Daromer mentioned. The initial boost charge was still on street 5.5 hours.

Thanks for correction Korishan.. yes discharge rate not including duration. Duration makes it capacity. Oops
Its been 5:45 on the timer (5hr 45m)
and its at 3.38 voltage
why is it dropping soo low
I heard 3.5v is the lowest safe voltage

I bought the charger new
Charger dischard to 3.30v with 6600mAh capacity. It didnt charge like how you guys said it would. if it helps here is the model number to the battery
samsung icr-22f

I have like 60 cells total. 4 kinds and 12 of them are a mix(because they are 3 same kind,3x4=12)
 
It should drop to 2.8V. Most cells range from 4.2 to 2.8 or even 2.5V so its nothing strange. All capacitities are down to 2.8 or lower if you check datasheed.

A full test can take up towards 12 hours if you need to fully charge, fully discharge and then fully charge again. A single test or instance of a good cell around 3-4 hours in general

1A during 2 hours is 2Ah...

Im pretty sure your 6Ah wasnt during discharge and during that test but during charge unless your tester is brooken.
Let us know when the Discharge test is done what the capacity is on it.
 
The nominal capacity of 22F is 2200mAh

The fact that you are getting 3 times thatnumber is wrong

It's likely that the Opus is in err.. is this the case with all the cells?
 
daromer said:
It should drop to 2.8V. Most cells range from 4.2 to 2.8 or even 2.5V so its nothing strange. All capacitities are down to 2.8 or lower if you check datasheed.

A full test can take up towards 12 hours if you need to fully charge, fully discharge and then fully charge again. A single test or instance of a good cell around 3-4 hours in general

1A during 2 hours is 2Ah...

Im pretty sure your 6Ah wasnt during discharge and during that test but during charge unless your tester is brooken.
Let us know when the Discharge test is done what the capacity is on it.
It said the arround same amount. Even during charge it will say it put in arround 6600mAh

I am trying another type of cell
Model: US18650GR

Doing charge test at 200mA and after that ima try another 4 cells @ 1000mA and see what I get. Like you guys said the sells could be bad so going to do few test with differnt cells and post results.

Another thing is, when I did charge test with these "US18650GR" batteries. 3 of them displayed "discharge test" and they were dropping voltage, But 1 said "charge test"

all batteries said full. its been on testing for a night and still till now. Hopefully they finish tonight

as for the charge, it does discharge test, and thats it, it doesnt charge after. this charge is new and use just to charge.
 
hermitdave said:
The nominal capacity of 22F is 2200mAh

The fact that you are getting 3 times thatnumber is wrong

It's likely that the Opus is in err.. is this the case with all the cells?
Thats what im going to test, because It may be the cause of bad cells so I dont want to just keep testing the same 4
 
MikelSandoval said:
hermitdave said:
The nominal capacity of 22F is 2200mAh

The fact that you are getting 3 times thatnumber is wrong

It's likely that the Opus is in err.. is this the case with all the cells?
Thats what im going to test, because It may be the cause of bad cells so I dont want to just keep testing the same 4

Charge goes thrush the following phases in order
* Charge cells to highest possible V.. max 4.2
*Discharge at rate selected
*Charge back at rate selected once discharge is complete

Once discharge phase is complete, it will display the capacity
 
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