Difference in values?

[The_Professor_2019]

So this morning my K1000 arrived with two Kamry branded batteries.

At the same time my LiitoKala Engineer Lii500 charger arrived.

So I have both batteries on charge now.
Both are in theory identical 18350s.

Both supposedly 900mAh.

They have been on charge for 53mins

One feature on the charger is the display of the internal resistance of the batteries. One is showing 125mO and one is showing 65mO....

Does anyone know why this should be?

It it a sign that one has been stored under better conditions than the other?

 

[The_Professor_2019]

Battery 1

 

[The_Professor_2019]

Battery 2

 

[stols001]

It may be a sign you were sold rewraps. It's just a thought. IDK.

Anna

 

[jandrew]

So this morning my K1000 arrived with two Kamry branded batteries.

At the same time my LiitoKala Engineer Lii500 charger arrived.

So I have both batteries on charge now.
Both are in theory identical 18350s.

Both supposedly 900mAh.

They have been on charge for 53mins

One feature on the charger is the display of the internal resistance of the batteries. One is showing 125mO and one is showing 65mO....

Does anyone know why this should be?

It it a sign that one has been stored under better conditions than the other?

Hard to say exactly. What brand of batteries and were they from a reputable supplier?

 

[The_Professor_2019]

These are the batteries that came with the mod....

Not the ones I have ordered through work....

So I am wondering where the errors are?

I have put them both through a test, to see what happens. The have discharged and are now in the recharge cycle. It seems that the capacities are only about 1/3 of the value on the wrapper.....

The next test is to swap bays in the charger to see if the value changes....
That will give me an idea of if there is an issue with the charger....

But I am thinking I may have to combine two hobbies. I may make an Arduino charger that has data logging, accurate information and also export full charging data CSV so I can graph it on a pc....

 

[greek mule]

It may be a sign you were sold rewraps. It's just a thought. IDK.

Anna

These batteries are Sigelei and of course they are rewraps.
Also they are of ICR chemistry.

 

[The_Professor_2019]

So after cycling through a full discharge and change test, the rate a 860 and 870 mAh.

So close to rated value.
The voltage is within 0.1

But there is still the internal resistance difference.

Will update after a few charge cycles.

 

[sonicbomb]

Good batteries are good batteries, bad ones are bad.

Mooch's Recommended Batteries | E-Cigarette Forum

UK/Europe

Batteries Plus - Specialists in rechargeable batteries for cordless phone, mobile phone, digital camera, solar light and torch batteries and a large range of button cells, all at Batteries Plus in the UK
Fogstar - The UK's #1 trusted source of 18650 Batteries
NKON | nkon.nl
myepack.co.uk


North America

www.liionwholesale.com
www.imrbatteries.com
www.illumn.com
www.rtdvapor.com
www.batterybro.com
www.orbtronic.com

 

[The_Professor_2019]

True...


And a couple of burn-in cycles makes a world of difference

They are worlds apart from when they came out of the box!

But yes, the quality of the battery is of paramount importance.

 

[mimöschen]

Burn-in cycles? With LiIon cells?
No way. Lithium chemistry batteries don't have anything like that.
Only (older) NiMH-cells require this.

 

[The_Professor_2019]

All I can say is that they are behaving completely different now, as to the moment I took them out if the box

Their charging characteristics have changed. And their output characteristics have also changed.

The only difference is they have gone through a few test cycles in my charger and been vaped with a few times.

 

[DaveP]

Those are 18350's? You might want to take a look at Mooch's 18350 battery tests for reference and pick cells that have his blessing for safety and performance. I may have duplicated part of SonicBomb's previous battery test post.

18350/18500 Safety Grades and Pulse Performance Data | E-Cigarette Forum

 

[mimöschen]

All I can say is that they are behaving completely different now, as to the moment I took them out if the box

Their charging characteristics have changed. And their output characteristics have also changed.

The only difference is they have gone through a few test cycles in my charger and been vaped with a few times.

That is highly unusual. Dirty and/or faulty contacts on the charger and/or batteries seem much more plausible.

 

[The_Professor_2019]

I have chosen my vape batteries. And some of them are spoken highly of in the forums.

The whole reason for this post was more the differences between two so called identical batteries.

Interesting that there is now no displayed difference between them, and they also nownow t out as marked, and the quality of vape has improved...

So there really does seem to be evidence that the batteries do change after a couple of charge/discharge cycles.

 

[jandrew]

It is possible that batteries that have sat a long time, or weren't formed/finished properly at the factory, may need a few cycles to see their optimal performance:

Battery Musing: Do our batteries need to be "broken in" to see max performance?

 

[greek mule]

I would like to hear @Mooch's opinion about it.

The whole reason for this post was more the differences between two so called identical batteries.Interesting that there is now no displayed difference between them, and they also nownow t out as marked, and the quality of vape has improved...So there really does seem to be evidence that the batteries do change after a couple of charge/discharge cycles.

 

[charlie1465]

I would like to hear @Mooch's opinion about it.

Yes @Mooch His opinion would be good. This is interesting to say the least

 

[The_Professor_2019]

Once my other branded batteries arrive, I shall compare them as well.

I must admit, I am glad for the flat battery in my other mod, as it made me cycle these batteries and enjoy the vape they now give

 

[greek mule]

Yes @Mooch His opinion would be good. This is interesting to say the least

I read @jandrew's link.Spot on!