Advanced Lipo questions?

[area51racer]

Ok all, so I have had my gensacearespammers 3S, (2) Blue Lipo 2S for maybe 6-8 months now (both 5000mAh) and I ALWAYS balance charge them, run them until they hit LVC (3.7V) and balance charge again, and store them. I've never actually timed my runs, but I believe I have 15+ mins of run time.


I read on another forum that your not supposed to run them until they hit LVC? Because it takes some life away?

All of my packs are like new, and perform like new....Never any off-balanced packs either.


Just wanna know what's up. Thanks

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[slowngreen]

I run ALL of my packs until LVC hits. Rarely have a pack go bad either. I wouldnt worry so much about it if I were you. Plus since their cheap, its fairly easy to replace one if it dies on you. I have some packs that I've charged, never balanced, prolly over 100 times easily and I run them till lvc everytime...

 

[area51racer]

I run ALL of my packs until LVC hits. Rarely have a pack go bad either. I wouldnt worry so much about it if I were you. Plus since their cheap, its fairly easy to replace one if it dies on you. I have some packs that I've charged, never balanced, prolly over 100 times easily and I run them till lvc everytime...

Maybe its just the Venom fan boys having that problem. Thanks for your input!

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[Lessen]

Hmmm. Even IF it did have an effect on overall lifespan I doubt it would be significant. It's not overstressing the cells, just using all the available energy. Plus, since you're balance charging everytime you limit imbalance which might have been more pronounced with deeper discharges. I don't think you have any major issues at all.

 

[area51racer]

Hmmm. Even IF it did have an effect on overall lifespan I doubt it would be significant. It's not overstressing the cells, just using all the available energy. Plus, since you're balance charging everytime you limit imbalance which might have been more pronounced with deeper discharges. I don't think you have any major issues at all.

Just the answer I was looking for

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[Greywolf74]

Just to throw this out there. most folks I know set the LVC at 3.0 or 3.2 (I personally switch back and forth depending on what I'm doing but usually set mine at 3.2) If it cuts off at 3.0V under load then not under load the lipo should still have around 3.2-3.4V per cell. plenty enough left as long as you charge them within 24-48 hours. Sooner the better obviously. By doing this even at 3.2V/C You'll probably increase your run times from 15 minutes to 30-45 minutes. At least that's typically what I get out of my 5000mah packs depending on what rig I'm running them in. I think most people would agree with me that you can run them down this far without any serious side effects as long as you make sure you don't leave them at that low of a voltage very long. Absolutely nothing wrong with setting your LVC to 3.7 but just thought Id throw that out there in case you wanted to see longer run times. 3.0LVC I believe is generally considered the LVC point that most people say you don't want to run your packs down to. You will never have a problem running them down to 3.7V and I seriously doubt you'd ever have a problem running them down to 3.2V. 3.0V is a little more risky but I've never had a problem as long as I charge them right away. From what I understand (this understanding comes from talking with a battery expert that works for a company that sells bulk batteries of all kinds to companies that make packs and sell them, they also sell to the public. Pretty cool website if you're ever interested in building your own packs. They sell everything you need. Id have to look up the URL if anyone is interested.) the damage point is actually 2.8V or lower but the problem you could run into with 3.0V is that if your voltage not under load slips to 3.0V or lower your smart charger might refuse to charge it. I've never had this happen to me. the lowest I've ever seen my Lipos get running with a LVC of 3.0V is about 3.2V since the cut off is the cell voltage under load you still have a small cushion there. At any rate I'm at work and its dead so I'm bored as hell. Sorry for the wall of text. Boredom does terrible things to people

 

[2revo1maxx]

I run mine at 3.3 volts and have no issues. The balance is a little off when I put them on the charger, but not much. Besides, when the esc sees 3.3 volts under load the batteries will spring back to somewhere around 3.7 anyway.