bought 3 batteres. Shows 3,58V on every 4p. Scam?

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qepasa   10 µW

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bought 3 batteres. Shows 3,58V on every 4p. Scam?

Post by qepasa » Jul 16 2018 6:16am

Hi friends.
Last week i bought 3 batteries 10s4p. LG MJ1.
On every 4p it measures 3,58V.

Seller said that batteries are new unused, and that every cell got 3,6v as should be.
Why i got 3,58v?
is it because it waited on shelf and self discharge happened?
Or is it because they were used the same way all 3 and now they got same number of cycles?

Or maybe something different?
Should i return that? it wasn't cheap, and i don't feel like it was a great offer. Should i return them to seller?
I do not have BMS and charger yet to charge them and check.
Last edited by qepasa on Jul 16 2018 3:43pm, edited 2 times in total.

kdog   10 kW

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Re: bought 3 batteres. Shows 3,58V on every 4s. Scam?

Post by kdog » Jul 16 2018 6:33am

How are you measuring the cells? Why are you measuring 4s?
Measure each cell individually and write down all the individual cells (not the aggregate)
3.58v could be an individual cell V they were shipped at, are you sure you're not making a mistake somehow?
Hopefully you are... bc 3.58v/4 is less than 1v per cell which is toast.
Keep us posted.

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thunderheart   100 W

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Re: bought 3 batteres. Shows 3,58V on every 4s. Scam?

Post by thunderheart » Jul 16 2018 7:11am

qepasa, where did you buy? Can you take some photos or shoot a video how you're measuring?
Miboxer C2-4000 smart charger/discharger review: www.youtube.com/watch?v=jrbJceNXv1g
XTAR DRAGON 4-slot charger/discharger review: www.youtube.com/watch?v=S6yVMsIuauE
Top 21700 cells LG M50 vs Samsung 48G: www.youtube.com/watch?v=KGJDogOG4zw

:arrow: All my reviews in one place: http://ThunderheartReviews.blogspot.com

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www.recumbents.com   10 kW

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Re: bought 3 batteres. Shows 3,58V on every 4s. Scam?

Post by www.recumbents.com » Jul 16 2018 12:28pm

I think you had a typo and meant that on every 4P (parallel) group you are seeing 3.58V, not 4S (series) as you wrote.

That's pretty close to the stated 3.6 V per cell group, so it should be fine. You will need to charge it before using it the first time.

Warren

qepasa   10 µW

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Re: bought 3 batteres. Shows 3,58V on every 4s. Scam?

Post by qepasa » Jul 16 2018 3:30pm

ummm sorry
i meant 4p !!!!!
very sorry, so sorry :)
I was of course measuring whole 4 cells connected together.

So i had a response from seller, he stated that many cells like sanyoGA or mj1 cames with 3.5-3.6 and it is typical.
I got batteries from local vendor here in my city.
Labels printed on cells indicate that they were produced on III quarter of 2017. Do you think it is too old to be used? In theory lets assume they were stored in circa 20 degree Celsius, and since produced 12 months passed. How many % of capacity are lost?

999zip999   100 GW

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Re: bought 3 batteres. Shows 3,58V on every 4p. Scam?

Post by 999zip999 » Jul 16 2018 3:51pm

Charge your battery and report all numbers
1. 3.99v
2. 4.20v
3. 4.19v


10. Xxx volt

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fechter   100 GW

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Re: bought 3 batteres. Shows 3,58V on every 4p. Scam?

Post by fechter » Jul 16 2018 4:03pm

The voltage on any battery will change depending on the state of charge, temperature, etc. There is a pretty wide range that would be considered healthy, about 3.0v to 4.2v.

Having all the cells near the same voltage is probably more important than the actual voltage. Your cell voltages sound fine.
"One test is worth a thousand opinions"

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Re: bought 3 batteres. Shows 3,58V on every 4p. Scam?

Post by docw009 » Jul 16 2018 11:22pm

I am not surpised by the original poster's situation. The last two batteries I brought from China were shipped at 3.6V per cell group.It makes sense to build them at this voltage and then hold then until they get sold. The only thing they have to worry about is the BMS draining the cell group used to power it if it doesn't get sold for a long time.

.

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Re: bought 3 batteres. Shows 3,58V on every 4p. Scam?

Post by redilast » Jul 22 2018 4:27pm

~3.6v is very typical for new cells. They made SOC for shipping even more strict in the past couple of years I think its <30% SOC now.

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