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Can I re-marry baterries measured with this?
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#1 (permalink)      6/7/2016 9:10:47 PM US Central   quote/reply + tips
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DanTo
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Can I re-marry baterries measured with this?
Let's say I have a large pool of married baterries of a same type.

If I measure them all with this charger, can I group them better according to the two criteria - mAh and internal resistance? There isn't any third criterium that I would miss?

(Disregarding that it may be inaccurate in measuring IR - I'm hoping that, if it errs, it will err the same on all of them).

And the chemistry would be the same, of course.
#2 (permalink)      6/8/2016 12:20:53 AM US Central   quote/reply + tips
ChrisMute
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The resistance measurements are not too precise according to the lgyte review.
But it is a great charger for the money, problem free and constant charging compared to the Xtar VC4 where you need THE perfect USB power supply and a magic moment plugging in the cable for a stable charge rate.

The resistance fluctuations on the first slot on the Lii-500 are something i can live with.
But it's not a simple +5/10/15 on all measurements, it is really just a rule of the thumb-indicator at best.

I would go by the capacity measurement to decide if a marriage is ok and take the resistance only as a gimmick unless something is way off.
The problem with with the above is that, from a thermodynamic perspective, a coil is not a bucket.
#3 (permalink)      6/8/2016 2:41:09 AM US Central   quote/reply + tips
Randall_H
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I think you would be safe to do it if you ran the full test mode where it charges, drains and recharges the battery. If they both take about the same number of maH to charge from empty to full, they are probably suitable partners.

That's my thinking anyway...
#4 (permalink)      6/8/2016 3:24:32 AM US Central   quote/reply + tips
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Sossij
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I think you'd need to match the discharge under load characteristics so that the terminal voltages stay close together. I guess the internal resistance would be important, but I don't know if there's something unmeasurable within the chemistry of the cell that is the dominant factor.

If it were me, I'd just pair them up randomly and run them in a dual series reg mod and measure the voltages periodically.

(As an aside, I noticed that my Cuboid battery meters were showing different levels with a couple of sets of batteries, but the voltages displayed with the 'hidden' battery voltage display were actually within 0.02 volts. Seems odd that the meter bars don't match up with the measured voltage. But I digress)
"You quit cigarettes, you started vaping, and now you're Einstein"
#5 (permalink)      6/8/2016 8:56:57 AM US Central   quote/reply + tips
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DanTo
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Here's one set of measured mAh of a pair, measured with SKU 2355100:

1 - 2113 / 2223 / 2178 / 2189 / 2186 / 2134
2 - 2168 / 2174 / 2251 / 2122 / 2248 / 2203

I can't make anything of it. They were in a series (regulated) mod, randomly rotated.

That's why I ordered the LiitoKala, to make more tests. It hasn't arrived yet.


Edited on 6/8/2016 at 9:00 AM. Reason:
#6 (permalink)      6/8/2016 1:13:52 PM US Central   quote/reply + tips
JPBel
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The only things that can eventually "marry" cells are :

- Discharging them in parallel.(assuming their contacts resistances are the exact same.)
- Charging them in series in a balancing charger.
#7 (permalink)      6/8/2016 2:25:37 PM US Central   quote/reply + tips
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quarks
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JPBel wrote:

The only things that can eventually "marry" cells are :

- Discharging them in parallel.(assuming their contacts resistances are the exact same.)
- Charging them in series in a balancing charger.



I wish human marriages were done this way. My first wife had high contact resistance, so I was discharged to the point of no return. She has a full charge these days :)

But I agree, the whole mystique of battery marriage is obfuscated in folklore and urban myths.


Edited on 6/8/2016 at 2:27 PM. Reason:
#8 (permalink)      6/8/2016 2:39:53 PM US Central   quote/reply + tips
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OneBadwolf
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If your mod is a Realeaux, the mod will tell you the voltage of all 3 batts independantly, and will not operate if they are too uneven.

(From on 5 clicks then hold down all three buttons for 10 seconds)

A good way to determine for sure if different batts are close in capacity safely. It will also balance charge the batts, but takes forever.

A decent excuse if you need one to justify a new RX200S....

Edited on 6/8/2016 at 7:27 PM. Reason:
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#9 (permalink)      6/8/2016 5:08:20 PM US Central   quote/reply + tips
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Vapor
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The charger should have the tools to ruff match cells just fine for our use.
It is time we stop accepting the things we cannot change, and start changing the things we cannot accept...
#10 (permalink)      6/8/2016 6:01:31 PM US Central   quote/reply + tips
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quarks
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Vapor wrote:

The charger should have the tools to ruff match cells just fine for our use.



What is ruff match?

#11 (permalink)      6/8/2016 6:26:26 PM US Central   quote/reply + tips
Hiko9
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if you want to do a proper job of "marrying" cells get a lipo balance charger from the radio control toy industry. Solder balance charge wiring into battery holders for the number of cells you wish to balance

Use this always to balance charge batteries.
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