Vapcell S4 Plus 4 slot 12A chargers usd37.99/ pcs,and looking for professional testers

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vapcell Dennis
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will34 wrote:
Where can I order the 10440? Can’t find them in your aliexpress shop.

will sell battery in Ali soon Smile
Agro
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vapcell Dennis wrote:
Agro wrote:
I see a high current 14500. Oh yeah, finally something worthwhile in this format. Party

Thanks

Could you help me?

Why did all my pictures disappear?

I quoted links to pictures that could be displayed before.

Now it’s gone.


When I look at the source of the first post – there are image links there.
Copying a link and opening in another tab shows me image – so this is working.
However when I reload the BLF site and look at network requests – my browser tries to load the images but your server refuses to give them with error “403 Forbidden”.
I don’t know maybe your web admin added some embedding “protection”?
Anyway the issue seems to be with your image host.
vapcell Dennis
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Agro wrote:
vapcell Dennis wrote:
Agro wrote:
I see a high current 14500. Oh yeah, finally something worthwhile in this format. Party

Thanks

Could you help me?

Why did all my pictures disappear?

I quoted links to pictures that could be displayed before.

Now it’s gone.


When I look at the source of the first post – there are image links there.
Copying a link and opening in another tab shows me image – so this is working.
However when I reload the BLF site and look at network requests – my browser tries to load the images but your server refuses to give them with error “403 Forbidden”.
I don’t know maybe your web admin added some embedding “protection”?
Anyway the issue seems to be with your image host.

Thank you very much. I uploaded photos on a different website.

Now it’s all right.

Pete7874
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Looking at the below discharge graph, this 16340 has more capacity at 5A than at 2A? Something doesn’t sound right.

Anyway, I ordered a few from illumn to try.

Barkuti
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Pete7874 wrote:
Looking at the below discharge graph, this 16340 has more capacity at 5A than at 2A? Something doesn't sound right.

The fact we cannot understand something does not make it impossible. Such phenomena can happen. For example:

 

Source: HKJ's comparator and review of Samsung ICR18650-30B 3000mAh (Green) @ lygte-info.dk.

 

maukka
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In general, I’d just ignore mAh readings. Wh is a much better indicator of capacity.

My 16340 800mAh Vapcells still haven’t arrived even though I ordered them on April 4th. Once they were returned by customs and sent again.

Johm
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Capacity is the whole are below the line in this graph not just the finishing point.

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The Vapcell 16340’s I tested at 3 amps seem to follow the supplied graphs pretty well. It’s the best 16340 I have tested.

Pete7874
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Johm wrote:
Capacity is the whole are below the line in this graph not just the finishing point.

I was referring to the actual capacity values listed in the table directly below the graph.
will34
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Sometimes you get higher capacity at higher discharge rate because the battery “doesn’t get discharged completely”. This is why energy is a much precise way to measure the real capacity because it can be translated directly into lumens/hours.

Barkuti
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I concur energy is a more precise way of measuring absolute performance or delivered energy.

Johm wrote:
Capacity is the whole are below the line in this graph not just the finishing point.

The area below the line curve is delivered energy, which is the integral of the voltage curve over the delivered capacity for the given voltage range and discharge rate. Or something like that, haven't touched formal maths for ages.

 

vapcell Dennis
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Pete7874 wrote:
Looking at the below discharge graph, this 16340 has more capacity at 5A than at 2A? Something doesn’t sound right.

Anyway, I ordered a few from illumn to try.

!https://i.imgur.com/XkTpbjx.jpg!

When the battery is discharged to 2.5V, the discharge capacity of large current may exceed that of small current. But there won’t be much difference. Smile

vapcell Dennis
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Barkuti wrote:

Pete7874 wrote:
Looking at the below discharge graph, this 16340 has more capacity at 5A than at 2A? Something doesn’t sound right.

The fact we cannot understand something does not make it impossible. Such phenomena can happen. For example:


 



Source: HKJ’s comparator and review of Samsung ICR18650-30B 3000mAh (Green) @ lygte-info.dk.


 


Nice test, Thumbs Up

vapcell Dennis
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maukka wrote:
In general, I’d just ignore mAh readings. Wh is a much better indicator of capacity.

My 16340 800mAh Vapcells still haven’t arrived even though I ordered them on April 4th. Once they were returned by customs and sent again.

sincerely apologize for the delay in shipment.

Hope to be in your hands as soon as possible. Smile

vapcell Dennis
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moderator007 wrote:
The Vapcell 16340’s I tested at 3 amps seem to follow the supplied graphs pretty well. It’s the best 16340 I have tested.
Thumbs Up

Thanks you very much Beer

Pete7874
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vapcell Dennis wrote:
Pete7874 wrote:
Looking at the below discharge graph, this 16340 has more capacity at 5A than at 2A? Something doesn’t sound right.

Anyway, I ordered a few from illumn to try.

!https://i.imgur.com/XkTpbjx.jpg!

When the battery is discharged to 2.5V, the discharge capacity of large current may exceed that of small current.


Why is that?
vapcell Dennis
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will34 wrote:
Sometimes you get higher capacity at higher discharge rate because the battery “doesn’t get discharged completely”. This is why energy is a much precise way to measure the real capacity because it can be translated directly into lumens/hours.

energy is More important。 AH*V=WH

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Pete7874 wrote:
vapcell Dennis wrote:
… the discharge capacity of large current may exceed that of small current.

Why is that?

Because of temperature induced chemistry reactions inside the cell. As a general rule heat improves the performance to some extent, chemistry dependent of course. While lots of modern cells do not show increased capacity at larger discharge ratios, increased heat reduction in internal resistance is common.

 

Smile 

moderator007
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Barkuti wrote:

Pete7874 wrote:
vapcell Dennis wrote:
… the discharge capacity of large current may exceed that of small current.

Why is that?

Because of temperature induced chemistry reactions inside the cell. As a general rule heat improves the performance to some extent, chemistry dependent of course. While lots of modern cells do not show increased capacity at larger discharge ratios, increased heat reduction in internal resistance is common.


 


Smile 


That was my thought as well. I have seen li-ions that were cold and run under a 3 amp discharge actual slightly increase in voltage as they were being discharged because the internal heat from being discharged warmed the cell which gives it the ability to provide more current. Since the discharge current is constant the cell doesn’t have to work as hard warm so the voltage goes up slightly. A warm cell will give more capacity in a discharge test than a cold one in my experience.
vapcell Dennis
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moderator007 wrote:
Barkuti wrote:

Pete7874 wrote:
vapcell Dennis wrote:
… the discharge capacity of large current may exceed that of small current.

Why is that?

Because of temperature induced chemistry reactions inside the cell. As a general rule heat improves the performance to some extent, chemistry dependent of course. While lots of modern cells do not show increased capacity at larger discharge ratios, increased heat reduction in internal resistance is common.


 


Smile 

That was my thought as well. I have seen li-ions that were cold and run under a 3 amp discharge actual slightly increase in voltage as they were being discharged because the internal heat from being discharged warmed the cell which gives it the ability to provide more current. Since the discharge current is constant the cell doesn’t have to work as hard warm so the voltage goes up slightly. A warm cell will give more capacity in a discharge test than a cold one in my experience.

Thumbs Up

So do I.

djozz
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Ordered 2 pieces of 10440 batteries from the aliexpress store. Will check them out Smile

Thanks again for getting us a new type nice battery Dennis.

Pete7874
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Got my 16340 cells from Illumn.

Capacity test using 500 mA discharge current on Lii-500:
.

IR, measured using a DMM and resistors:
Cell 1: 0.21 Ohm
Cell 2: 0.20 Ohm

RelakS
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10440 shouldn’t have a button top option? I will see if it will reach the positive contact in my DQG Tiny.

vapcell Dennis
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RelakS wrote:
10440 shouldn’t have a button top option? I will see if it will reach the positive contact in my DQG Tiny.

we have button top , we will add it in web,sorry

vapcell Dennis
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Pete7874 wrote:
Got my 16340 cells from Illumn.

Capacity test using 500 mA discharge current on Lii-500:
.

IR, measured using a DMM and resistors:
Cell 1: 0.21 Ohm
Cell 2: 0.20 Ohm

Thanks for the test, a bit low cap

we test it more than 750mah

RelakS
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vapcell Dennis wrote:
RelakS wrote:
10440 shouldn’t have a button top option? I will see if it will reach the positive contact in my DQG Tiny.

we have button top , we will add it in web,sorry

Is it possible to add this button top to my current order? It is awaiting shipment at this moment.

vapcell Dennis
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RelakS wrote:
vapcell Dennis wrote:
RelakS wrote:
10440 shouldn’t have a button top option? I will see if it will reach the positive contact in my DQG Tiny.

we have button top , we will add it in web,sorry

Is it possible to add this button top to my current order? It is awaiting shipment at this moment.

yeah, contact Ali Customer service staff to change it

Pete7874
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vapcell Dennis wrote:
Thanks for the test, a bit low cap

we test it more than 750mah


No problem. It may just be the nature of this charger/analyzer (Lii-500). It consistently indicates lower capacity figures on all cells I test with it by about 5-6%.
RelakS
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Pete7874 wrote:
vapcell Dennis wrote:
Thanks for the test, a bit low cap

we test it more than 750mah


No problem. It may just be the nature of this charger/analyzer (Lii-500). It consistently indicates lower capacity figures on all cells I test with it by about 5-6%.

If I am correct, Vapcell measures capacity with 0.2C, which gives 150mA instead of 500. Maybe, this is the reason of the difference?

Pete7874
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RelakS wrote:
Pete7874 wrote:
vapcell Dennis wrote:
Thanks for the test, a bit low cap

we test it more than 750mah


No problem. It may just be the nature of this charger/analyzer (Lii-500). It consistently indicates lower capacity figures on all cells I test with it by about 5-6%.

If I am correct, Vapcell measures capacity with 0.2C, which gives 150mA instead of 500. Maybe, this is the reason of the difference?


The chart they posted (see below) shows them measuring capacity using various current levels, starting with as low as 0.5A and going up to 8A. At 0.5A, their tested capacity is 812mAh. The main difference is their cutoff voltage is 2.5V. Mine is 2.8V, but there can’t be much capacity left there at that point.

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