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Old 12-24-2012, 10:58 AM   #21 (permalink)
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Quote:
Originally Posted by jime View Post
Mike Dabrowski was going to experiment with using some of the new high capacity sticks, like Eli has, in combination with the older sticks. In theory, it should work, but I don't know what he determined.
You can't mix them. They will tear each other apart. The differing IR will very quickly result in an unbalanced pack. Very quickly, like, in days.
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Old 12-24-2012, 11:07 AM   #22 (permalink)
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You measure capacity by the discharge Mah, not the charge Mah. You really don't care how much effort the charger took to charge the battery, you care about what it holds.

For example, a normal stick might take 6.5Ah and give back 6.0Ah, while a high resistance stick might take 6.5Ah and give back 4Ah. The other 2Ah never made it into the stick and was dissipated as heat during charging.

All that you care about is that the sticks all match each other and that they have reasonable capacity (> 4Ah discharge). It doesn't matter if they're all a little weak as long as they are matched to each other.

Also, charge and discharge at 5+A if you can to give it a workout and to save time. Run 5 cycles. You should see improvement in discharge for at least 4 of those cycles. You can stop cycling when you see less than a 10% improvement from the previous discharge. If you start to see it go down by more than 20% from cycle to cycle, that stick is bad.



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I've been able to cycle 4 sticks so far and found one that dropped like a rock whenI put it through the initial discharge cycle. Only been two cyles now but cell capacity has incresed 700 mAh. So if This trend continues what are the odds of this stick staying balanced if put back in service. If I decide to return it to service would it be advisable to force it to a higher SOC than the remaining sticks in hopes that it will help it stay balanced?
The last charge took 4.025 Ah, according to the smart charger.
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Old 12-24-2012, 02:31 PM   #23 (permalink)
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Thank you for your concise description of stick cycling,
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Old 12-26-2012, 07:52 AM   #24 (permalink)
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Originally Posted by Subdewd2 View Post
Thank you for your concise description of stick cycling,
If you want to share your test results, I'll be happy to give you tips on how to interpret them.
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Old 12-27-2012, 12:02 AM   #25 (permalink)
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I had a pack that sat for a while, bought a charger from this site supposedly already set up. I cycled #1, 2 and 3 three cycles each about a month ago, didnt record the history, then cycled again last week when I finally figured out hot to access history. 6 through 9 were all charged last week, 3 cycles each. I'd love an expert opinion.

#1.
D1. 4515. C1. 254,
D2. 351. C2. 147.
D3. 288. C3. 6742

#2.
D1. 4389. C1. 167.
D2. 200. C2. 6759
D3. 6747. C3. 174

#3.
D1. 4945. C1. 232
D2. 359. C2. 165
D3. 306. C3. 149

#4.
000. 7736
6193. 6677
6303. 6774

#5.
000. 7866
6206. 6749
6339. 6968

#6.
000. 002
024. 7724
6237. 6856

#7.
000. 8046
6319. 6889
6330. 6889

#8. Refused to charge

#9.
000. 7910
6233. 6840
6378. 151

The first three cycles of 1, 2, 3, I couldn't figure out how to access history so as I said 1,2,3 were cycled 3 times before these numbers.

Settings @ 10 amp discharge, 5 amp charge, cut off peak 6mV, cut off 0.70 discharge, trickle 0.35a, .......7700ah capacity??

I'm sure most are toast but as you see many don't make sense. Any idea what I'm doing wrong? Sure appreciate an opinion before I move on or cycle these any more. Thanks

Last edited by wingin73; 12-27-2012 at 12:12 AM.
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Old 12-27-2012, 07:49 AM   #26 (permalink)
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Which charger are you using and what are the charging/discharging parameters you have set?
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Old 12-27-2012, 07:55 AM   #27 (permalink)
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Which charger are you using and what are the charging/discharging parameters you have set?
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Old 12-27-2012, 11:12 AM   #28 (permalink)
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Using a Superbrain 989

Settings @ 10 amp discharge, 5 amp charge, cut off peak 6mV, cut off 0.70 discharge, trickle 0.35a, .......7700ah capacity??
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Old 12-27-2012, 11:34 AM   #29 (permalink)
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Okay. A few things:

Use 0.9V as your minimum - you are over-discharging them
Use 5mV as your deltaV - you are overcharging them.

Use a 20 minute delay time between cycles to allow proper cool-down.

Use 10A charge and 10A discharge to save time.

Pay attention to your clips. If they're getting hot, you don't have a good connection and are not getting accurate readings. You can make cables using wire and ring connectors.

EVENTUALLY, 10A discharge will fry your 989. If you back down to 5A,it will last a lot longer. You will also find that the connector on the side of the unit will eventually melt.

For stick 8, if the V of the battery is close to 0V, run a 1A or even a 0.1A charge for a little while to wake it up. After you've put some charge in, it will be able to take higher charging rates.

You need to redo at least 2 cycles of each stick to get numbers that we can use.


Quote:
Originally Posted by wingin73 View Post
Settings @ 10 amp discharge, 5 amp charge, cut off peak 6mV, cut off 0.70 discharge, trickle 0.35a, .......7700ah capacity??

I'm sure most are toast but as you see many don't make sense. Any idea what I'm doing wrong? Sure appreciate an opinion before I move on or cycle these any more. Thanks
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Old 12-27-2012, 01:58 PM   #30 (permalink)
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Thank you....

I will do exactly that. I am in fact melting the power supply to charger negative side banana clip thus ill redo that as well as put ring connectors on the battery connectors.

I'm not in a hurry and I don't care to damage the superbrain so ill just go with a 5a discharge / 5a charge.
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