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› Charging at 2c ????
12-03-2007 02:15 AM  9 years agoPost 21
smcbmw

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Louisville, Kentucky

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Obviously I do not want to buy another charger, so what are some good inline balancers that I could use????

10-8

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12-03-2007 02:18 AM  9 years agoPost 22
fenderstrat

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Aston,Pa

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that I cant help you with, because I've had the CELLPRO since April and have no need for a seperate balancer,so I have not kept up....maybe someone with some more knowledge can post.......hope I helped

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12-03-2007 02:20 AM  9 years agoPost 23
smcbmw

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Louisville, Kentucky

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You did very much !!! Thanks alot.

10-8

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12-03-2007 03:38 AM  9 years agoPost 24
rogeroverout

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DFW area, TX

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Cellpro (and any charger that charges each cell separately through the balance leads) works fine for >1C... BUT... watch out for wire gauge on the larger packs. My 6S 5000 MaH packs would required 10 amps per cell... Way, way, way, too much for balance wires.

TP1010 + TP210 + data cable is fine. TP210 with ANY OTHER charger is NOT for >1C; no way to shut down.

Flight Power "V" balancer, in "link" mode, is an inline and will cut the charge. Works with most chargers. Most notable exception is the Astro Chargers... their "pulse" mode of finishing the charge causes the V to cut early. Works great with most other chargers.

There may be others... but those are the three general setup that I know about. To the specific question asked earlier: Triton charger with TP balancer is NOT SAFE for >1C charging.

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12-03-2007 03:45 AM  9 years agoPost 25
smcbmw

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Louisville, Kentucky

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I have checked with the flightpower v balancer and it looks pretty good. Does flightpower and TP have the same balance connectors?

10-8

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12-03-2007 04:41 AM  9 years agoPost 26
fenderstrat

rrProfessor

Aston,Pa

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Cellpro (and any charger that charges each cell separately through the balance leads) works fine for >1C... BUT... watch out for wire gauge on the larger packs. My 6S 5000 MaH packs would required 10 amps per cell... Way, way, way, too much for balance wires.
the cellpro4S only charges 2-4s packs up to 4 amps so this is not a concern.....my big packs (2100mah) can charge at about 2C(slightly less)...my smaller ones I can do at 2 or 3 C

and it would require 10 amps total(6s 5000mah)for 2C not 10 amps per cell..that would be 60 amps to charge that battery
...

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12-03-2007 06:11 AM  9 years agoPost 27
rogeroverout

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DFW area, TX

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and it would require 10 amps total(6s 5000mah)for 2C not 10 amps per cell..that would be 60 amps to charge that battery
Hard to believe, isn't it? But true. Two ways to see this, first:

How many amps does a single 5000 MaH cell take to charge at 1C? 5 Amps. At 2C, it will take 10 amps. That's what will go through one balancer wire to one cell if charging at 2C.

Second, look at it this way: Charging a 6S 5000 MaH battery through the regular connector at 2C takes 10 Amps at (6 * 4.2 per cell) = 25.2 total pack volts, that's 10A * 25.2V = 252 Watts.

Charging each individual cell at 2C takes 10 Amps at 4.2 volts. 10A * 4.2V = 42 watts. The total will be times 6 cells. 42 Watts * 6 = 252 watts. Exactly the same as above. (as it should be).

Or, to put it very concisely, 242 watts = 24.2V*10A and also equals 4.2V*60A.

As you point out, the cellpro is capable of neither 6S nor of that many amps on each single cell. In fact few chargers (whether "serial" or "parallel") are capable of 250 total watts. This is a 'watch out' when buying any charger. And most charger manufacturers are very quiet about their total watt rating.

Back to 2C charging through the balance connector: On larger packs, assuming you could find a charger that would do it, the wiring in the balancer connector just ain't big enough.

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12-03-2007 06:16 AM  9 years agoPost 28
rogeroverout

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DFW area, TX

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I have checked with the flightpower v balancer and it looks pretty good. Does flightpower and TP have the same balance connectors?
Flightpower used to use a different balancer connector. About 6 or 8 months ago (or maybe a year?) they switched to the same as ThunderPower.

The V balancer comes with adapter cables that fit "new" FP and all TP... adapter cables for other battery types are available from FP.

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12-03-2007 06:42 AM  9 years agoPost 29
charlieh

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Vancouver, BC, Canada

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Charlie; Was that guy you quoted (I went and read it) an expert?
That guy is the site admin of the the commensense technical forum. I'm not using commonsense lipo but I don't have problem charging my lipo at 2C.

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12-03-2007 06:54 AM  9 years agoPost 30
MolokaiBoy

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Lahaina, Maui,Hawaii USA

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I think that charging higher than 1C becomes more crucial in that when charging at higher rates individual cells have more of a tendancy to go out of balance or higher than recommended voltages.

Incorporating a good balancer that communicates with the charger to assure the individual cells don't get overcharged is the key.

I have started charging 6S 5000mAH packs at 8.25A (highest my charger will push for a 6S) no issues whatsoever. I keep tabs on individual cell voltages, my batteries haven't gotten hot.

Les
Maui RC Modeler's, Big Island RC Helis, http://www.facebook.com/mauirc

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12-03-2007 02:06 PM  9 years agoPost 31
fenderstrat

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Aston,Pa

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rogeroverout....your math makes no sense........it doesnt matter if its a 1s pack or a 6s pack the C rating remains the same....e.g.a 1s 5000 mah pack 2c is 10A for a 6s 5000maH pack 2C is 10A
Charging each individual cell at 2C takes 10 Amps at 4.2 volts
4.2V is the cell total V when done, it is not the charging V for the entire charge
How many amps does a single 5000 MaH cell take to charge at 1C? 5 Amps. At 2C, it will take 10 amps. That's what will go through one balancer wire to one cell if charging at 2C.
....if there is only one cell in the pack it would not need balancing leads just discharge leads......and discharge leads can handle 10A easy

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12-03-2007 02:16 PM  9 years agoPost 32
copperclad

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NY

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hi fenderstrat
so if you have a 6S 5000 mah pack charging at 2C or 10A the charge is divided among 6 balance leads...or about 1.6 A per cell
if you have a single 5000mah cell and run 1.5 amps to it , i come up with 0.3C , am i confused

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12-03-2007 02:19 PM  9 years agoPost 33
fenderstrat

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Aston,Pa

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if you have a singe cell, that one cell gets the whole charge or 10A(at 2C)if the pack has 4 cells the charge is divided among the cells

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12-03-2007 02:23 PM  9 years agoPost 34
copperclad

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NY

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hi

so just for the sake of argument , if you had six chargers charging 6 single cell 5000mah lipos , wouldn't each charger be pushing 10 amps to each cell for a 2C charge rate

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12-03-2007 02:24 PM  9 years agoPost 35
fenderstrat

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Aston,Pa

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yes,that would be correct

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12-03-2007 02:29 PM  9 years agoPost 36
copperclad

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NY

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so with six chargers you need 10 amps for each cell to charge at 2C , but a single charger can do the same work at only 1.6 amps per cell , i guess i am still confused

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12-03-2007 02:32 PM  9 years agoPost 37
fenderstrat

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Aston,Pa

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you are not considering time.....the 6S pack is going to take a lot longer to charge than 1 single cell
....the C rating has nothing to do with the number of cells..its the power the battery can store/discharge

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12-03-2007 02:38 PM  9 years agoPost 38
copperclad

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NY

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hi
you are not considering time
we are talking at 2C , if your single charger , charges your 6 cell 5000mah battery at 10 amps total , we are talking roughly 0.3C

think about the difference with two cells ( say 1000mah , nicad @ 1.2 volts )

if you hook them up in series you double the voltage but the amperage stays the same ( 2.4volts @ 1000mah )

and if you hook them up in parallel the voltage stays the same but the current doubles ( 1.2volts @ 2000mah )

do you see what i'm getting at , i guess i could still be confused

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12-03-2007 02:45 PM  9 years agoPost 39
fenderstrat

rrProfessor

Aston,Pa

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we are talking at 2C , if your single charger , charges your 6 cell 5000mah battery at 10 amps total , we are talking roughly 0.3C
you also have to consider pack wiring...series/parallel

if the pack is 5000 mah than the C rating is 5A..... if it is split between 6 cells than thats the TOTAL.......I may not be explaning myself clearly

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12-03-2007 02:48 PM  9 years agoPost 40
mille

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Stockholm Sweden

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hi,

I charge my 3s 3300mah lipos with the e-station BC-6 charger/balancer at 2C no problems.

M

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