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A123 charger

Old 02-10-2007, 11:25 PM
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akm
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Default A123 charger

What are people using to charge these cells? I am very intreasted in these cells but I do not want to purchase a new charger. I currently have a superbrain 989 and a ln-5014. Is there any way I can charge these cells with these chargers?
Old 02-10-2007, 11:29 PM
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Default RE: A123 charger

http://slkelectronics.com/lipodapter/index.htm
Old 02-11-2007, 12:32 AM
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akm
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Default RE: A123 charger

I saw the lipodapter. Is anyone using it and how well does it work. Are there any reviews on this product yet?
Old 02-14-2007, 05:18 AM
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Default RE: A123 charger

I have a Common Sense Balance Charger which works well up to 4 cells.....I wonder if it will work? Any thoughts/comments?...............[8D]
Old 02-14-2007, 11:25 AM
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Default RE: A123 charger

My A123 charging post / graphs on RC Groups.

http://www.rcgroups.com/forums/showp...96&postcount=1
Old 02-14-2007, 11:29 AM
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Default RE: A123 charger

If you read the A123 racing specs. they clearly state the cells can be charged up to 4.2V per cell but it is best not to charge them past 3.6 per cell.
If you do not mind monitoring the voltage and stop the charge when the cells reach approx. 3.65-3.7 ,at which time voltage will rise quickly with no useable capacity added and if you do not mind chargein at less than 1C then yes that charger will work.

Charles
Old 02-14-2007, 11:31 AM
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everydayflyer
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Default RE: A123 charger

There is a rather length charging thread here

http://www.rcuniverse.com/forum/m_4667864/tm.htm
Old 02-14-2007, 01:29 PM
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Default RE: A123 charger

I'm using a 'universal car laptop adapter' for charging 4 cells. It can go to 7 cells within spec and possibly more. Cheap on ebay (£8 in the UK). Minimum modifications are to bypass the voltage setting switch with a trimpot and to change the leads. Other things to consider are a meter to see what's happening, a new container for better cooling and reverse polarity protection.

Technically these are 'wattage-limited' switch-mode power supplies that boost 12v. So they can only be used to charge 4 or more cells. Two sizes are available, 80 and 120W. The 80W version with 4 cells starts at around 10A and drops to about 6A as the pack voltage rises (80W / 14.4v = 5.5A). These currents are ideal for these cells. I describe the basic unit on my site and will update it with my A123 experiences within a week.
http://www.flyelectric.ukgateway.net...er.htm#laptop1

Regards, David.
Old 03-20-2007, 08:50 PM
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Default RE: A123 charger

So.......will the LN-5014 charge A123 cells........safely?
Old 03-21-2007, 01:49 PM
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Default RE: A123 charger


ORIGINAL: AIRPLANENUTS

So.......will the LN-5014 charge A123 cells........safely?
No, You need a charger that charges only to 3.6 volts/cell. LN 5014, Triton take them to 4.2 volts/cell which is detrimental to the packs.
Old 03-21-2007, 04:07 PM
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Default RE: A123 charger

Thank you, Mr. Scholefield. I'd love to try them, but I'll be hanged if I'm going to buy another charger. I may eat those words later.
Old 03-21-2007, 04:58 PM
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Default RE: A123 charger

For a smaller investment you can regulate voltage with an addon device:
http://www.slkelectronics.com/lipodapter/index.htm
David.
Old 03-21-2007, 06:40 PM
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Default RE: A123 charger

Everyone is recomending the dapter but no one has said if they have used it yet and how well it works. Can anyone provide a link for a review of this product?
Old 03-21-2007, 07:30 PM
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Default RE: A123 charger

I got one of the first that Sid put out. It works as advertised.
Old 03-21-2007, 07:37 PM
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Default RE: A123 charger

See post #5 where I provided a link to a charging thread which has many graphs using th Dapter. Yes they work extremely well not only for A123s but LiPolys as well.

Charles
ORIGINAL: akm

Everyone is recomending the dapter but no one has said if they have used it yet and how well it works. Can anyone provide a link for a review of this product?
Old 03-21-2007, 07:55 PM
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Default RE: A123 charger

Sommer just released their latest update (4.5x) for the miniron chargers that handles A123 http://www.sommer-electronic.de/ Charging is terminated at 3.6V
Old 03-21-2007, 09:15 PM
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Default RE: A123 charger

I don't see much mentioned on cell balancing for the a123 batteries. Does this mean you are not doing it and you don't think it's important? What is everybody doing?
Old 03-22-2007, 06:30 AM
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Default RE: A123 charger

It would be nice if they had an English conversion...........[8D]
Old 03-22-2007, 10:23 AM
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Default RE: A123 charger


ORIGINAL: rcj

I don't see much mentioned on cell balancing for the a123 batteries. Does this mean you are not doing it and you don't think it's important? What is everybody doing?
I have cell balancing taps on all my 4 cell A123 packs. Works great with the CellPro. I have found the A123 stays pretty well in balance, but since I use the CellPro almost exclusively for charging they get the same balancing as my other LiPos. If I need more charging capability I check balance on the pack and if it looks OK move it to another charger - Xtrema is my other favorite.
Old 04-23-2007, 11:54 AM
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Default RE: A123 charger

10s a123 charge at 36 volts i.e. three 12 volts lead batteries or your CCCV power unit...
Old 04-24-2007, 09:27 AM
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Default RE: A123 charger


ORIGINAL: ramboman

10s a123 charge at 36 volts i.e. three 12 volts lead batteries or your CCCV power unit...
This is kind of risky since 12 volt lead acid batteries can have a voltage from 11.8 volts to 13.6 when fully charged.
Old 04-24-2007, 10:51 AM
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Default RE: A123 charger

There is a big gap between theory and real life.
I charge my sealed lead battery at 13.6V on my "home" power unit.
When fully charged and disconnected from the power unit, voltage drops to 12.6V.
3 time that makes 37.8V, not critical at all for a 10s pack (that accept for a short period 4.2V per cell)
More, voltage is not defined by the lead batteries, but by the a123 pack under charge
this is 36V, no more, until the end of the CC phase (80%)
Difference is due to cable and internal resistance (ohm rule)
Current drops to zero when both batteries (lead and a123) are level.
Just test it, looking at the wattmeter: it works exactly like that.
Adapt the lenght of the cable to stabilize the current around 20A (10s2p pack)
during the first 12 min and stop manually (if you are afraid) when a123 voltage
raises above 3.7V (for example).
I charge 2 packs together at 40A, there is no alternative on the market today.
Sorry, there is one: a generator and a CCCV power unit (Tanic) set to 20A 36V.
It works perfectly following a123 specifications. That's what I use at home, without the generator
and set to 12A 36V for a low speed charge (3A 3.6V per cell) of both 10s2p packs.

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