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When this happens, I use a stand alone balancer to get both cells to the same level, let the pack sit for a while, then measure the resistance using an esr meter to determine if one cell is weaker than the other. Measuring ir while charging isn't necessarily accurate.
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Regarding this particular battery, I’m going to run it through a few different cycles and tests before disposing of it.
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I've had 3 protek batteries that do the same thing. I've also had 2 that were just fine. Doesn't matter what your charge rate is the battery is just junk. Cycling 20 times and it won't fix it. I contacted Amain for one of my batteries that had the issue, and they replaced it after I sent them a picture of it on my icharger. However, I just dealt with the fact that the other two are for practice. I now run R1 batteries. I've also heard good things about the EAM batteries.
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Originally Posted by nexxus
(Post 15165774)
When this happens, I use a stand alone balancer to get both cells to the same level, let the pack sit for a while, then measure the resistance using an esr meter to determine if one cell is weaker than the other. Measuring ir while charging isn't necessarily accurate.
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Originally Posted by tbrymer
(Post 15165777)
I've had 3 protek batteries that do the same thing. I've also had 2 that were just fine. Doesn't matter what your charge rate is the battery is just junk. Cycling 20 times and it won't fix it. I contacted Amain for one of my batteries that had the issue, and they replaced it after I sent them a picture of it on my icharger. However, I just dealt with the fact that the other two are for practice. I now run R1 batteries. I've also heard good things about the EAM batteries.
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Originally Posted by AZJP
(Post 15165772)
Hundreds if not thousands of people who run at the top level at their respective tracks in 17.5 and 13.5 charge and discharge at these astronomical levels. I agree, it sounds insane and dangerous, but 30+ guys at my track alone do this every race day and have been for many years without issue. A level of care and attention to the condition of the battery as well as a charger capable of monitoring and charging at these rates is necessary. I wasn’t a believer until I stepped up from 20 amps to 40 and started discharging. They also discharge at 40 but I’ve found 30 still gets the IR’s down for a punch that doesn’t fade for an entire race.
Your kinda on the cutting edge of charging and while alot of people may swoon over protek, its Amains off brand. Maybe the dude assembling the cells had a cold that day and messed up. There is no way to know these things. |
Originally Posted by AZJP
(Post 15165772)
Hundreds if not thousands of people who run at the top level at their respective tracks in 17.5 and 13.5 charge and discharge at these astronomical levels. I agree, it sounds insane and dangerous, but 30+ guys at my track alone do this every race day and have been for many years without issue. A level of care and attention to the condition of the battery as well as a charger capable of monitoring and charging at these rates is necessary. I wasn’t a believer until I stepped up from 20 amps to 40 and started discharging. They also discharge at 40 but I’ve found 30 still gets the IR’s down for a punch that doesn’t fade for an entire race.
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is it wise to charge a 2 cell lipo at 30 to 40 amps..hmm to me no.. why push a battery to those extremes?.. from the times you listed in charge time your no faster than me charging at 1C only in 15minutes i can charge my battery from 7.70 volts to 8.4. then back on the track no risk of fires to anyone. marshalls drivers around your charge anyone..
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Originally Posted by AZJP
(Post 15165779)
Are you an on road guy? I’ve also heard great things from the local guys who run their products. My next battery will be an R1.
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Originally Posted by Darkgenerals
(Post 15165760)
Please dont do this, if one cell is at 4.2 and one is at 4.0 it will continune to charge normally. When one cell is out of range always charge with balance and accept that is how this battery is.
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40A is by no way "astronomical"
I discharge @ 30A and charge at 15A if anyone cares 30A = 215W so, like a 13.5? The first generations of lithiums were a new frontier in batteries, maybe scared us into worrying too much of a fire, now I always charge in a lipo bag and won't walk away from a charging battery that i'm trying to get warm, but that's just basic responsibility, I have little belief that my batteries will actually burst into fire from what we're doing, especially if you're on the LiHV or whatever packs where we're only charging to 8.4 and they can supposedly take 8.6 |
Originally Posted by AZJP
(Post 15165772)
Hundreds if not thousands of people who run at the top level at their respective tracks in 17.5 and 13.5 charge and discharge at these astronomical levels. I agree, it sounds insane and dangerous, but 30+ guys at my track alone do this every race day and have been for many years without issue. A level of care and attention to the condition of the battery as well as a charger capable of monitoring and charging at these rates is necessary. I wasn’t a believer until I stepped up from 20 amps to 40 and started discharging. They also discharge at 40 but I’ve found 30 still gets the IR’s down for a punch that doesn’t fade for an entire race.
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Lol.
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It's possible that it's not discharging through the balance lead. I had this happen a couple of times with my 308duo when it was taking a long time to charge/discharge. Progressive eventually sent me a different charger. I would try a different charger. It does sound to me like it's possible the battery might not be optimal too.
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No other issues with other packs, fortunately.
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