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Old 07-20-2005, 03:38 AM   #1
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Default Equalize stick packs (6x GP3300 & G3700)

What is the best procedure for equilize the sticks packs ?

Considering that only equilize on fully charge is possible there are two way:

- Fully charge a packs at low amps (100 or 200 or 300mAmps for 33/37h or 17/19h or 10/13h)

- Fully charge with delta peack at 2 or 3 amps ... let the cells cool down, and then charge them for 2,3,4h at 100 or 200mAmp

Which way to you guy follow up ... and how often do you equilize your cells ?

Thanks

e_lm_70

Last edited by e_lm_70; 07-20-2005 at 04:57 AM.
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Old 07-20-2005, 06:43 AM   #2
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The only way of getting close to equalising them is with a slow trickle charge at 0.1C i.e. 1/10th the capacity, so 330mA for a 3300 pack. No peak delta, they will charge in around 14hrs.

This is what model flyers do as part of their maintenance routine.
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Old 07-20-2005, 08:24 AM   #3
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How are you able to charge for 14h at 0.1 C ?

Ok, I can hack my charger to don't detect delta peak , but there is no way to configure precisly 330mAh charge ... or 300 or 400mAh ... as well the 14h can't be configured on my charger ...

One of my charge has also a protection it is not allowed to charge longer then 5h ... so I can't do a 0.1C on this charger !

What is the disadvantage to charge at 0.5C (with the lowest delta peak detection) ... and then after the battery is cool down, charge for 3/4 hours at 0.1C ????

Thanks

e_lm_70
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Old 07-20-2005, 02:43 PM   #4
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You could dead short after you put them on deans bulbs for about 20 minutes
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Old 07-20-2005, 03:55 PM   #5
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Just leaving them on a bulb discharger might "reverse" (negative charge) some cells, thus completely ruining the pack.

With all the hoopla on the Spintec Discharger, I think I'll try that on my F201 stick packs. Hopefully it works.
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Old 07-20-2005, 04:09 PM   #6
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Quote:
Originally Posted by e_lm_70
What is the best procedure for equilize the sticks packs ?

Considering that only equilize on fully charge is possible there are two way:

- Fully charge a packs at low amps (100 or 200 or 300mAmps for 33/37h or 17/19h or 10/13h)

- Fully charge with delta peack at 2 or 3 amps ... let the cells cool down, and then charge them for 2,3,4h at 100 or 200mAmp

Which way to you guy follow up ... and how often do you equilize your cells ?

Thanks

e_lm_70
I think that all the ways you have mentioned will work fine for equalising the cells at the top. (when they are full charged)
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Old 07-20-2005, 06:15 PM   #7
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I will be happy to share my process for truly equalizing stick packs..after the Nats!
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Old 07-20-2005, 06:42 PM   #8
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Default Now this is the way that you truly discharge stick packs

Have a look at the work of art Discharging stick packs is a breeze now
-Dave

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Old 07-20-2005, 07:05 PM   #9
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Quote:
Originally Posted by JDM_DOHC_SiR
Have a look at the work of art Discharging stick packs is a breeze now
-Dave
If the pic doesn't work try this pic'
Attached Thumbnails
Equalize stick packs (6x GP3300 & G3700)-stick-pack-discharger.jpg  
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Old 07-20-2005, 10:24 PM   #10
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I have modified my stick packs slightly so as to allow me to get contacts in between the individual cells and hook it up to a Novak equalizing discharge tray. It looks a bit like Frankenstein, but it works to equalize each cell of a stick pack individually just like you can do for a side by side pack. Unfortunately, I do not have the unit here at home tonight to post a picture, but will try to do so tomorrow.

One thing to keep in mind about every commercially built stick pack I have ever seen is that they spot weld a piece of cheap metal as the contacts between the cells. This crappy metal and connection method means that even if your stick pack is made up of premium 1.18+ V cells, the pack voltage will never be anywhere close to 6 X the rated cell voltage (as it should be with a properly assembled side by side pack), the connections simply stink. To get a better performing pack, I either make my own from scratch, or disassemble a premade stick pack, and substitute my own "find" of pretty thin but good copper strips as the connection between the cells, soldering them together. (If I choose the disassembly route rather than create my own from scratch, it is because I then get the stick pack tube and ends rather than pay Trinity $6 for a stick pack assembly kit in which I would otherwise thrown out everything but the pack tube, shrink wrap and pack ends.) I test every pack before and after modification on a Turbo 35, and almost every stick pack that I have disassembled and reassembled using my methods has shown a pack average voltage increase of about 0.2 volts, i.e., that is the same as getting a .03 V better cell (for example, 1.15 vs 1.18 individual cells) due solely to reassembly method.
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Old 07-20-2005, 10:36 PM   #11
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Quote:
Originally Posted by JDM_DOHC_SiR
Have a look at the work of art Discharging stick packs is a breeze now
-Dave

Thats one of the coolest things I've seen in a long time for r/c battery care.

-Korey
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Old 07-20-2005, 11:17 PM   #12
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Be careful when using the rig posted by DOHC_SIR. You might pierce the cell can if you tighten the thumbscrew too far. You can also try pushing long pins between cells and connecting the pins to resistors to discharge individual cells

One charger company used to advise people to connect a 30ohm resistor to stick packs to bring the cells down, but that was for nicads.
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Old 07-21-2005, 12:36 AM   #13
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Default copper

So does anyone use the copper wick material to build packs? Also what type of resistor is used in that equalizer?
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Old 07-21-2005, 01:17 AM   #14
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How often do you equilize your GP stick packs ?

Every week, month, year ... or every 10 cycles , 20 cycles ,, etc ?

Thanks

e_lm_70

P.S: I'm not going to create a frankestain for use standard equilizer created for side-by-side packs ... I think that with my equipment the best way is to fully charge 2 packs with 2.5 Amps individually ... let them cool down ... and then put them in serie and charge constantly with 200mA for 2.5h Hours ! ... this means in 5h works I should be able to equilize two packs ....
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Old 07-21-2005, 01:30 AM   #15
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Quote:
Originally Posted by eeyan
With all the hoopla on the Spintec Discharger, I think I'll try that on my F201 stick packs. Hopefully it works.
I have also a Spintec Disharger on the way.
But I'm afraid that if the pack is not well balanced, there is more risk to reverse some cells, then really enhance all the cells in the pack ...

e_lm_70

P.S: My Spintec will be one of the few with Deans
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