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  #21  
Old 12-12-2015
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adey adey is offline
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I had an lrp shorty swell after 2 weeks. That had only been charged once and balanced once. Not impressed with it. I have bought lipos from demon power products and now buy the nano tech ones and I charge them twice a night at racing and have never once had an issue. They are very cheap too. I appreciate what rude tony is saying, but I don't see how it makes any difference. Balance charging on a two cell is matching the voltage for both cells up to their capacity so they both together produce the maximum voltage they can, but as long as they are not being overcharged I really can't see why balance charging each time is an issue. Rude tony probably knows something I don't. I know he is hugely experienced and knows what he is talking about.
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  #22  
Old 12-12-2015
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orinoco orinoco is offline
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The balance charge theory is nonsense as I don't balance charge my cells every time, maybe once every 6 runs or so, not that I see how it can make any difference anyway. I treat all my cells the same way with no swelling to 4 sets of reedy saddles and 2 sets gens ace and 2 sets of hpi plazmas (My son and I both race 2 classes each meeting, hence the amount of cells......). Only the LRP's have swollen..........
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  #23  
Old 14-12-2015
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RudeTony RudeTony is offline
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Sorry to add another spanner to this discussion but chargers are obviously an important factor to what is going on.
Some chargers, cheaper ones mainly, are a factor.
This is why the BRCA check voltage at BRCA Sanctioned events and you can't go on track with more than 8.40.
Many of the cases are the chargers used.

In my experience, Orion are good as are the LRP. I believe Muchmore good too. Sorry don't about others.
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  #24  
Old 14-12-2015
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I use the same charger to charge all my cells............only the LRP's swell.
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  #25  
Old 14-12-2015
Dr Fly Dr Fly is offline
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Hang on, lets get some fact into this. statements like, "do not balance charge" can be misleading, and cause much more swelling if people dont get the context of it

Whilst there is not any real need to balance charge a pack every time, it takes several charge/discharge cycles for a pack to go out of balance. There is also no harm being done when you balance charge a battery. You have much higher chance of damaging a pack by non-balance charging an out of balance pack. Than balance charging every time.

Swelling is caused when you get oxidation of the internal Anode and Cathode of the battery. This can be caused by internal contamination (poor manufacturing) high current charge and discharge. Exceeding the voltage limits of the pack, and also by too much heat.

Exactly what causes your pack to degrade is entirely down to your own circumstances, every pack in this thread could have a different problem, or they all could be from the same batch, who knows. But once a cell starts to degrade, it will only get worse and worse, as the reduced performance will cause more oxidation.

Personally, I use LRP (2 years old), Reedy (1 year old), Losi (3 years old), Thunder-power (3 years old) and Nano-Tech (3 years old) packs. I dont take very good care of them. I balance charge everything at 6amps, which is the max of my charger. I throw them in a car run my five minute race, then throw them back in a box. on a race day i use 2 packs, one on charge, and one in the car. I never storage charge.

The only swelling in any packs is from one of the LRP ones, which i left fully charged by mistake for several weeks. The losi and thunderpower packs are now on there way out, in that the internal resistance is so high, that the voltage drops under acceleration that the car goes into limp mode. This means the pack has got to the end of its racing life, but still no swelling.

If i had issues with several cells all puffing up, i would start to check my charger cut off limits, i would also look at the way i use my cells compared to others. Belive it or not, we had a guy in the club Who's charger cut off voltage was so out of calibration, that it popped open a brand new pair of saddles.

Also check the temp that your batteries are coming off the track, are they hotter than others? All these things add up, and all cause swelling.
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  #26  
Old 26-12-2015
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Adam F Adam F is offline
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I had three brand new lrp shorties, all of which swelled up in a fairly short timescale.

I then went back to orion (4500/100) and hey, no swelling after over a year, on the same charger.

Worth mentioning that some on here will always push their sponsors stuff, no matter the brand or their experience.
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  #27  
Old 26-12-2015
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Lee1972 Lee1972 is offline
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Quote:
Originally Posted by Adam F View Post
I had three brand new lrp shorties, all of which swelled up in a fairly short timescale.

I then went back to orion (4500/100) and hey, no swelling after over a year, on the same charger.

Worth mentioning that some on here will always push their sponsors stuff, no matter the brand or their experience.
Same here as I have a LRP shorty and both LRP and Nosram saddles as well as other brands: Thunder Power, Turnigy, Reedy and Orion and they're the only ones that show any sign of significant swelling with the exception of one of my Orion saddle packs but they've been well used and are probably on their way out.
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  #28  
Old 02-01-2016
Piles Piles is offline
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Personally I'm very dissapointed with my LRP shortys and wont be buying any again. I bought some only 3 weeks ago and found their IR to be higher than 18 month old batteries I have. I bought the LRPs to replace these previous Lipos because I thought they were getting high.
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