Sanyo UR18650AA red, discharge info?

italianuser

Active member
Joined
Feb 25, 2020
Messages
246
I received the cells from EnergyCells, cells 90% of capacity. Very bad shopping experience for the total lack of customer service BUT... the cells arrived, they shipped a few hours before I was ready to cancel order. And the cells were very well packaged, looked real good and how @Wolf teaches they were individually labelled. Seems great, seems an excellent product. It's a real pity that Tim doesn't manage customers, really, man... I already spoke my mind about this in another thread 🤦‍♂️ ok, lets go to the cells.

Sanyo UR18650AA.jpeg Samsung 22P.jpeg Cell details.jpeg

Now my question is about the Sanyos... I ordered 200 Sanyos UR18650AA and 200 Samsung 22P.

Of the first three random Sanyos I tested, two had SD problems so I was quite worried. The Samsung cells are perfect, good IR, good capacity, low SD. So now I'm testing another 12 Sanyos, I have the results for the first 6, and I wanted to know if the SD I'm measuring is normal because it's double respect to Samsung cells:

Cell #Capacity (Liitokala 500)V (after 2 hours)V (after 4 hours)V diff
122424.20164.19450.0071
222714.20434.19560.0087
322524.18914.18070.0084
422954.20884.19820.0106
522484.20274.19220.0105
622154.18424.17330.0109

Maybe I'm just paranoid because the first two cells were bad...o_O Is it normal (not that I'm addicted and paranoid, but that Sanyo are discharging twice as fast than Samsung lol) ?
 

italianuser

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Feb 25, 2020
Messages
246
I think I have an answer. Sanyo cells do actually discharge faster, a lot faster, than Samsung cells during the first hours. Now, after 24 hours, all cells are nicely settling around 4.18V. I was very concerned because the first cells I tested were bad (incredible coincidence). Ok, @Wolf I'm getting to know my cells, thanks bro(y)

I discovered something else during this test... One of my three Liitokalas charges less than the others... on average about 0.015V less, I'd never noted that until now. Don't have a solution for this, I could open it and have a look, I suppose output is regulated by a resistor network as some point... :unsure:
 

ziporah

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Apr 26, 2021
Messages
14
I ordered 500 of those Samsung cells. Mine don’t sit in the 90% range. About 40% is below 90%. I did test the cells between 4.2 and 3V. I have measured the IR for all of them and 30/500 are above 35m. In the end I kept 444 of the 500 cells resulting in 3153 wh use full capacity. The rest is discarded. The discarded high IR I’m using for a small 12v ups for my raspberry pi cluster. The rest is recycle bin. I was planning on getting some more but it appears somebody has been shopping their store empty. I don’t like the mixed boxes they offer as you don’t know the real capacity vs left capacity.
 

italianuser

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Feb 25, 2020
Messages
246
Yes, I wouldn't buy from them any more. I didn't try many of the Samsung cells yet, I'm concentrating on the Sanyo ones. Of the 18 Samsung ICR18650-22P I tested (random picks), they all were over 90% of the nominal capacity 2150mAh (minimum 1938, maximum 2062). Consider that datasheet (here) states that IR for new cells is <=35mOhm:

1623365852266.png


1623365816944.png


I'll surely share the outcome of the complete test. These cells they sent look ****ing great.

These are the Samsung cells:

Samsung-ICR18650-22P.jpg

EDIT: well, yes, reading your post again I think you knew standard IR for new cells LOL
 

ziporah

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Apr 26, 2021
Messages
14
looking at the labels on your batteries, they seem to be tested with their old tester.
I have a batch that has new stickers on them, they also show the IR of the battery, measured during the cycle. I didn't keep them apart in my tests, so I'm not sure these are better capacity rated or not.
I'm testing all cells with a ZB206, charging with TP4056, resting 10+ days, capacity test down to 3V, rest 10 days, charge to full , measure IR YR1030 and depending on IR + Cap store for building, store for ups or small battery use or discard.
I will test a batch of 12 (that's how many ZB206 units I have) up to 2.75, to see how the results are compared to the label on the battery.
I can share the results as well, I've put them all in a google sheet

1623389936684.png
 
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