lgabc11865 help please

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egam

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lgabc11865

http://secondlifestorage.com/t-LG-LGABC11865-Cell-Specifications?pid=9083


I got a lot of "refurbished" HP 9 cell 93 WH batteries that have a a nominal voltage of 11.1 and a capacity of 8100 mah.
They are new packs with maybe some shelf time, but they look great. The cells and the packaging is very clean

I opened one up to test the lgabc11865 cells and put them in my opus setup on the "Charge plus Test" mode at 1 amp charge/discharge rate.
After cycling, they give me between 1550 and 1750 mah. The voltage I see on them in this modeis around 4.15 volts.

So the data sheet linked from the database listing above says they should be 2800 mah nominal 2700 mah cells.
It also lists a constant charging voltage of 4.35 V.

Would I see another 1000 plus Mah If I charged them to 4.35 V?

I am going to try it but I was looking for thoughts of the community before I tried it.
I'm not quite sure how to dial in 4.35 volts on my Imax b6. I don't think I can do it on the OPUS.
If I charged them at the 2S level at a low current, I could watch them until the voltage got to 4.35 Volts, but that is not the same as charging them to 4.35V.
maybe at 200 mA they would be close to the 4.35.

Ultimately, I am wondering if they are fake cells.
 
No, you won't get another 1000mAh goin from 4.15 to 4.35. You'd probably get about 300-400mAh I would guess.
 
Another thing to consider is the standard capacity test in the spec sheet says the standard test is to discharge at .2c (which is roughly 540 mA) from 4.35 to 3v. Discharging at 1 amp will give lower capacity rating. How much lower? I'm an English teacher....that's way outside my pay grade!
 
If a 9 cell pack is 8400mah each battery should be 2800mah. 3s3p . If they test that low they might have sat too long. Try cycling them a few times. If they increase in capacity then they just need working. Otherwise they are damaged and should only be used for small projects
 
you may open your opus charger and set the "secret switch" to 4.35V, then try again and you'll see... and as Eric said, just use 500mA discharge rate.
 
I'd say the max extra capacity you're going to get is 28% more capacity. As for each 0.07V you add, you add a 10% on the battery capacity. So the max capacity you're going to get is 2250mAh at best, 2300mah if you're very lucky.
 
EricKoshinsky said:
Another thing to consider is the standard capacity test in the spec sheet says the standard test is to discharge at .2c (which is roughly 540 mA) from 4.35 to 3v. Discharging at 1 amp will give lower capacity rating. How much lower? I'm an English teacher....that's way outside my pay grade!
Click to expand...

I missed that....Good eyes, Eric!

jdeadman said:
If a 9 cell pack is 8400mah each battery should be 2800mah. 3s3p . If they test that low they might have sat too long. Try cycling them a few times. If they increase in capacity then they just need working. Otherwise they are damaged and should only be used for small projects
Click to expand...

J,
Thanks for the suggestion.

I cycled them 3 times and no real change in capacity. I'm cycling them again at 500 mA as Eric pointed out above.

BlueSwordM said:
I'd say the max extra capacity you're going to get is 28% more capacity. As for each 0.07V you add, you add a 10% on the battery capacity. So the max capacity you're going to get is 2250mAh at best, 2300mah if you're very lucky.
Click to expand...

I'm cycling them at 500 mA like Eric pointed out above. If the capacity improves, I will try charging them to 3.35V and then using the discharge mode at 500 mA.

Maybe if I stand on one foot and hold my tongue correctly, these cells will perform.

I hope they are good cells, because I have 15 packs of 9 cells. Thats about about 1.4KWhif it works out.
If I use them in a really big pack, the 500 mA will be ok. Charged to 3.15, they still will be about 1 kwh. And the life will be much longer.

owitte said:
you may open your opus charger and set the "secret switch" to 4.35V, then try again and you'll see... and as Eric said, just use 500mA discharge rate.
Click to expand...

Cool, I think I did remember there was a switch like that from an opus teardown video. I will watch it again before I try it.

Thanks for the Hack Owitte!!!
 
EricKoshinsky said:
Another thing to consider is the standard capacity test in the spec sheet says the standard test is to discharge at .2c (which is roughly 540 mA) from 4.35 to 3v. Discharging at 1 amp will give lower capacity rating. How much lower? I'm an English teacher....that's way outside my pay grade!
Click to expand...

It did not change the capacity on the discharge part of the cycle at 500 mA. The cells are still recharging, so I will know for sure after its done, but I believe it depends on the discharge part of the cycle to come up with capacity.

next step is to find the secret switch to change it to 4.35 charge voltage. Wash rinse repeat.
 
Aren't you afraid to damage the cells by pushing the voltage so high? I mean really, isn't the goal to keep the cells somewhat healthy at a nominal 3.7?
 
I had some houndred of LGDB118650, that seems to be the same chemical but 2600 mAh. Yes testing at 4.2V you got 20% less of power, the only problem here is when you mix with normal 4.2V cells.

All of us test the cells at 4.2V make our packs, claim to have a powerwall of x KWh and then set the charger to charge just until 4.1 or less to gain some clycles and not to stress the cells, we all lie to ourselves, at least with these cells you can charge until the voltage you tested the capacity. The problem as I told you before is that if you mix with normal 4.2 and set to 4.1 you will lose more than 30% of capable capacity.

I've made some numbers to mix them in separate packs with maybe 13s of these and 14s of 4.2V or 14S of 4.35V and 15s 4.2V and always the same, lose capacity in one or another type if you want to keep the other in a safe (not stressing) range.
 
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