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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Balancing Large Batteries
10-05-2018 07:28 PM  16 months ago
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Heli_Splatter

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Balancing Large Batteries
What is the best way of balancing large batteries that are 0.2 to 0.5 out of balance. My pocket balancer is way too slow. The charger does not really ever get the battery back to complete balance. Do you charge individual cells or do you discharge individual cells to get the pack back to balance?

I have no reason to believe that there is anything wrong with the cells as internal resistance is similar.
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10-05-2018 07:39 PM  16 months ago
gwright

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I've done this a number of times, charging through the balance port with a reciever charge cord. If you cut off the little plastic shield around it to expose the individual pins, it will plug right in. Just be very careful due to the exposed pins.Gary Wright
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10-05-2018 07:42 PM  16 months ago
Heli_Splatter

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Yes, I have done that in the past. I was hoping that by now there was a simple automatic solution. Thank you for responding.
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10-05-2018 07:55 PM  16 months ago
Heli Fanatix

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The simple automatic solution = use your charger’s balance connector

However ... manually charging each cell via battery’s balance plug is futile b/c we are just delaying a bigger problem. When our packs are not balancing, it’s on its way out of its usefulness.
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10-06-2018 12:41 AM  16 months ago
Heli_Splatter

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I would agree with you. When using parallel boards the batteries can get out of balance to the point that the charger cannot quickly get balance restored. This can happen on brand new batteries.
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10-06-2018 01:59 AM  16 months ago
pctomlin

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Texas

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Don't know what charger you have, but a Revolectrix PL8 is excellent at getting out of balance batteries back again. Done it for a couple of people at the club. As stated, as long as the cells are in good shape, a good charger should be able to rebalance the battery.
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10-06-2018 02:00 AM  16 months ago
ICUR1-2

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The best way is to balance charge every time. If you have a decent charger then the issue may be the battery.

I use a Hyperion 720 & have the option of balancing only.
spending time, paying attention
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10-06-2018 02:10 AM  16 months ago
Ace Dude

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Check to see how much balancing current your charger has. The better chargers have more balancing current.

Charging at a slower charge rate may help as well as not parallel charging.

On some chargers you can change the voltage where balancing begins. You can try lowering this and see if it helps.
  
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10-06-2018 11:58 AM  16 months ago
Heli Fanatix

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I used an PL8v2 with revolectrix parrallel board and gone up to 8 packs.

This is the secret: “charge each pack @ 500mah!”

As time goes by, increase it and we can see how high we can go while cells still balance.

I’ve got lots of chargers, my best charger is the PL8v2 ... the 4010 cannot balance as good or fast

Give it a go ... we may pleasantly surprised!
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10-06-2018 03:13 PM  16 months ago
Ace Dude

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When using the PowerLabs, use the Accurate presets as these increase balancing accuracy.  
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10-06-2018 03:22 PM  16 months ago
ICUR1-2

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Trying to get some flights in today quickly... balance charging is slow when you're in a hurry......

Luckily my nitro fired up and got some that way
spending time, paying attention
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10-06-2018 03:54 PM  16 months ago
Ace Dude

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ICUR1-2 Trying to get some flights in today quickly... balance charging is slow when you're in a hurry......
It's not an issue when you use the right charger and good batteries. I charge at 3C all the time.
  
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10-06-2018 06:12 PM  16 months ago
ICUR1-2

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Ace Dude It's not an issue when you use the right charger and good batteries. I charge at 3C all the time.
So very true . The condition and quality of the battery is very important.
spending time, paying attention
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10-06-2018 06:30 PM  16 months ago
Heli Fanatix

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The last phase of the charge cycle is to balance .. if your packs are good and don’t mind shaving < :50 or so off your flight time, terminate your charge cycle @ 4.15 and go fly!

I’m up @ 4:30am
- usually let my packs rest @ 3.9V
- Even at 500mah each
- packs are ready by sunrise!
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10-06-2018 10:07 PM  16 months ago
Heli_Splatter

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ok guys, here is what I would like to see. Charger puts power to all cells until one cell reaches max voltage then the charger would stop and only use balance port to charge remaining cells until they reach max voltage.

I don't think this exists. I am moving away from using any parallel boards as they can cause problems quickly. I almost always balance charge my batteries. slower but usually does the job better.

As the batteries get larger, this is a bigger problem.
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10-06-2018 11:13 PM  16 months ago
Heli Fanatix

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Try paralleling @ 500mah each.

Will even work with problem packs ... why not give it a try? What do you have to loose?
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10-06-2018 11:46 PM  16 months ago
Heli_Splatter

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I did try that yesterday. Yes a good idea.
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10-07-2018 01:58 AM  16 months ago
Heli Fanatix

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Glad it worked
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10-07-2018 02:10 AM  16 months ago
Ace Dude

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Heli_Splatter As the batteries get larger, this is a bigger problem.
This is the reason the PowerLabs have 1A of balancing current per cell. Many other chargers have considerably less.
  
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10-07-2018 04:20 AM  16 months ago
chopper37

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I’m with Ace, powerlab 3c all the time no issues
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Balancing Large Batteries
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