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Old Jul 30, 2014, 09:14 PM
Firepower
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Charging Panasonic NCR 18650 Batteries

I see people seem to get long flying times in some planes with the Panasonic NCR 18650 Batteries so have bought 4 of them to start with.

At present they are in a 6,000 lumen torch (probably not really 6,000 lumen) with three LEDs and the batteries seem to all be in parallel.

I want to charge them with a Accucel 6 charger so have bought a $2 holder which is wired in series.

Just deciding how to charge them.

I suppose I could rewire the holder and charge them in parallel but I guess the easiest way would be to charge them in series at 14.4v and 1amp on the Accucel 6 charger or can I charge as 4amps.

Thanks
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Old Jul 31, 2014, 01:00 AM
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You should not charge in series without balancing.
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Old Jul 31, 2014, 01:13 AM
Firepower
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Thanks - I do not balance charge my 3S LiFo battery in my Futaba 9c transmitter and check occasionally and the cells are still the same.

But you are correct I should not do it and these NCR batteries cost quite a bit more. I understand charging at 1amp per cell is the maximum.

So sounds like I need to rewire the battery holder to parallel and charge on the Accucell 6 charger at 3.6v and 4amps. I guess 4amps is correct?


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Originally Posted by desertstalker View Post
You should not charge in series without balancing.
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Old Jul 31, 2014, 09:39 AM
BVH
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The NCR's can be easily charged at .7C.
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Old Jul 31, 2014, 08:35 PM
Firepower
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I am not up to speed on the C ratings in relation to amps or what should be set on the charger.

So I guess:

3.7v 3400mah .7C

3400mah = 3.4amps
3.4amps x .7c = 2.38amps

So if I can charge one battery at 2.38amps I can charge 4 batteries in parallel at 9.52amps.

Would this be right?
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Old Jul 31, 2014, 09:01 PM
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NO NO those are Li-ion cells.. just charge them at 1 amp max in series.. 7c would be 23.8 amps that is incorrect and your charger will only charge at 6 amp
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Old Jul 31, 2014, 10:50 PM
BVH
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Many of us on the flashlight forum charge the NCR 18650B at .7C all day, every day. No issues at all - protected or unprotected cells.

But straight from the Panasonic Catalog data sheet Standard charge rate for the 3400 is 1625 mAh. So the 3400's can easily take .5C
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Old Jul 31, 2014, 10:57 PM
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Quote:
Originally Posted by ElectricMann View Post
NO NO those are Li-ion cells.. just charge them at 1 amp max in series.. 7c would be 23.8 amps that is incorrect and your charger will only charge at 6 amp
You must have not seen the decimal point. He said point 7C, not 7C.

LOL
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Old Aug 01, 2014, 05:36 AM
Firepower
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So the latest is charge them at 1amp in series.

It was mentioned earlier that if charged in series they should be balance charged.

I will not be balance charging them so charge in series or in parallel?

Anyone in AU need a good power supply which is about 100amps 1200watts then this is great:
http://www.ebay.com.au/itm/161317221...84.m1439.l2649

A mate bought two and I am using one. They are second hand and a resistor needs to be soldered onto the edge connector for it to provide 12v power. It is quite small in size. I offered $35 and got it.

EDIT: Just found this on balance charging which is not too hard to do.
How to make a 3S battery from reclaimed18650 lithium ion laptop cells (10 min 24 sec)
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Old Aug 01, 2014, 09:54 AM
BVH
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Again, Panasonic recommends 1.625 mAh, not 1 Ah.
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Old Aug 01, 2014, 10:43 AM
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Does he have the 18650 or 18650B cells?
Charge rates different perhaps?

The data sheet I've seen shows a charge rate of 0.825ma.
http://industrial.panasonic.com/www-...A4000CE240.pdf

I found a "Tentative" data sheet showing the 1625ma for the 18650B cells.
http://www.datasheet4u.com/download_new.php?id=783876

Even more interesting is this Panasonic data sheet showing 1925ma for the 18650 cell.
http://www.datasheet4u.com/download_new.php?id=783878
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Old Aug 01, 2014, 10:52 AM
BVH
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Pretty sure I saw "NCR18650B" somewhere in his posts yesterday but do not see them today. But I still see "3400" mentioned in post 5. From everything I've read, the 3400's are "B's".

So it would be good to know what cells you actually have Firepower?
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Old Aug 01, 2014, 11:18 AM
Firepower
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I have four 18650B NCR batteries. So for these 1.625amps and should take 4 hours to charge. The batteries are in parallel in the torch so would like to charge them all the same. Still need to charge them all the same when in a plane.

So I know what it is for one but what amps for four 18650Bs in:

1. Series (if recommended) - charge at ? amps
2. Balanced - charge at ? amps
3. Parallel - charge at ?amps

I need the answers in amps and not C rating as it is still not clear even thought I have goggled and read up on it.

I am still not sure what the C rating is for charging say 2200mah 3S 35C lipo. If I can charge at 1C how many amps is one C. I have been doing all my big batteries at like this:

2200mah 35C LiPo charging at 2.2amps
5800mah 35C LiPo charging at 5.8amps (I do have a Accucel 8 charger also besides six Accucel 6 chargers)

I call the above charging as 1 C but not sure.

Thanks for the comments so far.


Quote:
Originally Posted by BVH View Post
Pretty sure I saw "NCR18650B" somewhere in his posts yesterday but do not see them today. But I still see "3400" mentioned in post 5. From everything I've read, the 3400's are "B's".

So it would be good to know what cells you actually have Firepower?
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Old Aug 01, 2014, 11:47 AM
BVH
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Quote:
Originally Posted by Firepower View Post
I have four 18650B NCR batteries. So for these 1.625amps and should take 4 hours to charge. No, technically it would take just over 2 hours.The batteries are in parallel in the torch so would like to charge them all the same. Still need to charge them all the same when in a plane.

So I know what it is for one but what amps for four 18650Bs in:

1. Series (if recommended) - charge at ? amps - Definitely NOT recommended
2. Balanced - charge at ? amps Series with balancing - 1.62 Ah rate if your charger is able to be adjusted that fine, 1.6 Ah if not. Number of cells set to 4
3. Parallel - charge at ?amps - 6.5 Ah for 4 cells when charged in parallel - Set number of cells to 1

I need the answers in amps and not C rating as it is still not clear even thought I have goggled and read up on it.

I am still not sure what the C rating is for charging say 2200mah 3S 35C lipo. If I can charge at 1C how many amps is one C. I have been doing all my big batteries at like this:

2200mah 35C LiPo charging at 2.2amps
5800mah 35C LiPo charging at 5.8amps (I do have a Accucel 8 charger also besides six Accucel 6 chargers)

I call the above charging as 1 C but not sure. Yes, your 1C thought is correct for the above two batteries. 1C = 1 x's pack rated capacity in charging Amphour rate

How many "C" you can charge at is best determined by what the manufacturer of the cell says you can charge at max.

Thanks for the comments so far.
Answers in red.
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Old Aug 01, 2014, 12:39 PM
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1C-Rate is the capacity/1000
For a 1000mah pack = 1C =1A, 2C=2A
For a 3000mah pack, 1C-Rate = 3A, 2C = 6A

Charging or discharging, same story.
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