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Old Feb 25, 2008, 09:09 PM
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Is there a cheap way to charge a 4S A123?

I'm thinking about building a plane to use an A123 pack. Because it's A123, I think I'll need the extra volts that 4S provides. I was reading about the $10 3S charger, but is there a way to cheaply charge 4S? Thanks for the help.
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Old Feb 25, 2008, 09:14 PM
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Haralson County GA. USA
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FMA Cell Pro 4 if you are not in a hurry.,max. of 3A charge rate on 4S.

Charles
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Old Feb 25, 2008, 10:00 PM
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Sorry guys, here I go again, drinkin' and thinkin' ......
Why can we not use ANY funky charger (with a balancer hooked up to each cell)and the a123lipodaptthingy???????
Now we are talking 25 bucks for the a123 balancer and an a123 cut off thingamajigggymodizzlsizzle
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Old Feb 25, 2008, 10:01 PM
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....mosizzle.dizzle.com?
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Old Feb 25, 2008, 10:14 PM
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But as the OP did not list what chager(s) he has or even if he is planing on using 2300 or 1100 mAh cells there is a lot of fill in the blanks here.

Yes a Lipodapter will work if he has a 4S Li charger or a Ni charger capable of charging 12 cells or more and if it has high enough amps. output or he is patient.

I use a very old AF 112PK Ni charger a Lipdapter to charge B&D VPX 1100 mAh 4S packs at 5amps.

The 12volt Pb setting on a Triton will also work but will not give a 100 % charge but then neither will the Daptors.

Charles
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Old Feb 26, 2008, 03:29 AM
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The other option is a generic laptop powersupply from eBay switched to 14.4V. You can find them up to about 120W. Some folks use these with a fan added and some current limiting (a la zip line). You can get them either with AC input for use at home or 12V input to run off your car battery (or deep cycle). Given how cheap 200+W/10A chargers have become I would suggest they are a better, more flexible, no fuss solution.
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Old Feb 26, 2008, 05:53 AM
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this wont charge 4s a123 real fast but it will charge
$47
http://www.allerc.com/product_info.p...oducts_id=1872
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Old Feb 26, 2008, 08:44 AM
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Quote:
Originally Posted by everydayflyer
But as the OP did not list what chager(s) he has or even if he is planing on using 2300 or 1100 mAh cells there is a lot of fill in the blanks here.

Yes a Lipodapter will work if he has a 4S Li charger or a Ni charger capable of charging 12 cells or more and if it has high enough amps. output or he is patient.

I use a very old AF 112PK Ni charger a Lipdapter to charge B&D VPX 1100 mAh 4S packs at 5amps.

The 12volt Pb setting on a Triton will also work but will not give a 100 % charge but then neither will the Daptors.

Charles
I use a Triton with a Daptor. I charge at 3-5 amps and when the Daptor cuts off I re-start the charge at .2 amps until it goes off again a few minutes later. Wouldn't charging at .2 amps give close to a full charge?
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Old Feb 26, 2008, 01:42 PM
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Quote:
Originally Posted by kgfly
The other option is a generic laptop powersupply from eBay switched to 14.4V. You can find them up to about 120W. Some folks use these with a fan added and some current limiting (a la zip line). You can get them either with AC input for use at home or 12V input to run off your car battery (or deep cycle). Given how cheap 200+W/10A chargers have become I would suggest they are a better, more flexible, no fuss solution.
Sorry but was is a "zip line" ? Any link?

Tanks in advance,

/Håkan
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Old Feb 26, 2008, 01:50 PM
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Quote:
Originally Posted by everydayflyer
But as the OP did not list what chager(s) he has or even if he is planing on using 2300 or 1100 mAh cells there is a lot of fill in the blanks here.

Yes a Lipodapter will work if he has a 4S Li charger or a Ni charger capable of charging 12 cells or more and if it has high enough amps. output or he is patient.

I use a very old AF 112PK Ni charger a Lipdapter to charge B&D VPX 1100 mAh 4S packs at 5amps.

The 12volt Pb setting on a Triton will also work but will not give a 100 % charge but then neither will the Daptors.

Charles
The Goose on a Dapter will - I asked the designer and he also felt this was acceptable procedure
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Old Feb 26, 2008, 02:18 PM
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well I have used Sid's LiPo dapters many times and IMO even with double goose IMO it does not provide a full charge on A123 cells. Others may very well disagree. I have several Dapter assisted charges in my A123 charing thread .

http://www.rcgroups.com/forums/showthread.php?t=603368

As someone else posted if you reduce the charge rate near the end or if you reduce it and restart to get a kinda false CV stage you can come close.

This is the very reason my Dan Baldwin designed charge terminators aka
DB Terminators which I use with my Zip chargers are set to stop the charge a 3S to 11.55 V (3.85 per cell). These charges terminate at approx. 7 amps. charge rate which happens to be very close to the 8A max. recomended for the Dapters. I have found that if stoped at a lower voltage the cells are not full enough to prevent rather rapid voltage decay.

My calibration tool was my TP1010C. If the 1010 could add 20 or more mAh capacity right after a Dapter, modified AF109 or Zip / DBT charge then the cells were not reaching full charge.


Of anyone is interested there is a charge graph here showing an official A123 racing charger in operation.

http://www.rcgroups.com/forums/showp...7&postcount=26

Charles
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Old Feb 26, 2008, 03:41 PM
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Quote:
Originally Posted by hakank
Sorry but was is a "zip line" ? Any link?

Tanks in advance,

/Håkan

Zip cord is a term sometimes used to describe common lamp cord (electrical line). Since any wire has resistence it can be used in place of a power resistor to limit the flow of current.

My $10 3S A123 pack charger Thread

http://www.rcgroups.com/forums/showthread.php?t=747911

Charles
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Old Feb 26, 2008, 04:56 PM
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Quote:
Originally Posted by kmp647
this wont charge 4s a123 real fast but it will charge
$47
http://www.allerc.com/product_info.p...oducts_id=1872
Not worth it IMO as you still need an external balancer (if you want to balance your LiPos or A123s) so it ends up costing the same as or more than an integrated balance charger anyway and I prefer integrated balance chargers myself. Different strokes...
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Old Feb 26, 2008, 10:17 PM
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Thanks for the info. I've got a regular Cell-pro 4S, and a Parkzone NiMH charger, but I think the charge rate would be to low. Even my power supply is only rated for 3 amps(and only 13.8V). Part of the allure of the A123 is their ability to be charged fast. If I do it, I'll use the 2300 size cells.

Is there a way I could use something like Everydayflyer's Zip charger to charge 2 2S packs(which would then be run in series)?
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Old Feb 27, 2008, 07:04 AM
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Haralson County GA. USA
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Quote:
Is there a way I could use something like Everydayflyer's Zip charger to charge 2 2S packs(which would then be run in series)?
Short answer , if you have to ask then no!!!!!

Have you read the first post in that thread?

Do you understand Ohm's law?


If you have a voltage source which is greater than the battery and it is capable of delivering enough current and you have a means to limit the max. delivered current to a level which is safe for the battery and if you have a means to limit the max. voltage to a safe level then yes.


Charles
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