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Just bought my first Lipo - 9/26/2012 4:30 PM   
ElectricGuy007



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From: Owensboro, KY, USA
Status: offline 		The Lipos I ordered at the track.
I have two 5000Mah 25c Duratrax packs in hand right now, charged them half-way last night. These wont be used til next year
but i might go ahead and balance them when my charger gets here Friday.

Purchased 4 yes FOUR 4000mAh Duratrax 25c packs for stock racing.
A Hi Tec charger thats AC/DC that charges 4 packs at the same time.

People here have had good luck with the Duratrax Lipos. I know one guy thats ran them for 2 seasons without issue.

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RE: Just bought my first Lipo - 9/26/2012 4:44 PM   
SyCo_VeNoM



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quote:

ORIGINAL: ElectricGuy007

The Lipos I ordered at the track.
I have two 5000Mah 25c Duratrax packs in hand right now, charged them half-way last night. These wont be used til next year
but i might go ahead and balance them when my charger gets here Friday.

Purchased 4 yes FOUR 4000mAh Duratrax 25c packs for stock racing.
A Hi Tec charger thats AC/DC that charges 4 packs at the same time.

People here have had good luck with the Duratrax Lipos. I know one guy thats ran them for 2 seasons without issue.

f they are not being used till next year than put them on storage charge...
if you fully charge them, and let them sit you WILL damage them

Personally I wouldn't have charged them at all seeing they more than likely were at storage charge levels.

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RE: Just bought my first Lipo - 9/26/2012 4:57 PM   
ElectricGuy007



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quote:

ORIGINAL: SyCo_VeNoM


quote:

ORIGINAL: ElectricGuy007

The Lipos I ordered at the track.
I have two 5000Mah 25c Duratrax packs in hand right now, charged them half-way last night. These wont be used til next year
but i might go ahead and balance them when my charger gets here Friday.

Purchased 4 yes FOUR 4000mAh Duratrax 25c packs for stock racing.
A Hi Tec charger thats AC/DC that charges 4 packs at the same time.

People here have had good luck with the Duratrax Lipos. I know one guy thats ran them for 2 seasons without issue.

f they are not being used till next year than put them on storage charge...
if you fully charge them, and let them sit you WILL damage them

Personally I wouldn't have charged them at all seeing they more than likely were at storage charge levels.



One pack I discharged half way and it has 8.00V, the other one was 8.17V, What levels is the most dangerous?

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RE: Just bought my first Lipo - 9/26/2012 8:05 PM   
trax de max


 

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Status: offline 		3.85V per cell should be about right for storage.

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RE: Just bought my first Lipo - 9/26/2012 10:50 PM   
Haddi Taha



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Status: offline 		your username is electricguy007 who joined in 2007 and hasn't bought a lipo till now  ......


Enjoy the increase in speed and run time and the fact you don't have to juggle a hot NiMh pack anymore (lol..memories)




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RE: Just bought my first Lipo - 9/30/2012 2:05 AM   
DieHard1207



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Status: offline 		yeah...memories.

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RE: Just bought my first Lipo - 9/30/2012 11:06 AM   
Haddi Taha



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quote:

ORIGINAL: DieHard1945

yeah...memories.


I think everyone here has had a nimh pack that got to hot that the plastic cover on it melted.



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RE: Just bought my first Lipo - 9/30/2012 11:23 AM   
phmaximus



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RE: Just bought my first Lipo - 9/30/2012 2:35 PM   
DieHard1207



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RE: Just bought my first Lipo - 10/1/2012 3:22 AM   
DieHard1207



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Status: offline 		All my NiMh batteries are crap. They have been run for years and won't even hold a charge, let alone take one. I now have 2S lipo. How should I dispose of the NiMh batteries? Should I discharge them in salt water, and then throw them away, or what?

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RE: Just bought my first Lipo - 10/8/2012 12:00 AM   
hindupimp2384



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Status: offline 		DAMN DAMN DAMN are you serious about damaging lipos if they are fully charged and sitting for 7 months on the self.  What ill the Lipos do and how can u tell if they are damaged cause.  i back into RC after 7 month break and my lipos balance and charge fine.  But its my car is laggy and full trottle sometimes.  i have 3 lipos and all are doing that now never has it been laggy. 



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RE: Just bought my first Lipo - 10/9/2012 2:27 AM   
chase1


 

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Status: offline 		i left a couple of my 6s lipos charged for about 5 months and now the wont discharge past 3.8 volts per cell. is this a normal issue when stored fully charged?

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RE: Just bought my first Lipo - 10/9/2012 8:57 PM   
hindupimp2384



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Status: offline 		I think its dangerous to discharged past 3.4v per cell.



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RE: Just bought my first Lipo - 10/9/2012 9:34 PM   
Haddi Taha



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quote:

ORIGINAL: hindupimp2384

I think its dangerous to discharged past 3.4v per cell.



3.0 vs is the limit. if your battery rocks up at say 3.25v then u can still charge it but raise the cut off so it finish around 3.5v, thats safe



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RE: Just bought my first Lipo - 10/9/2012 9:37 PM   
EXT2Rob



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Status: offline 		I dunno about damage, but it appears to me that leaving them charged eventually lowers the useable capacity.  I've got 4000mah batts, and they won't charge up more than about 3000 now.......


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RE: Just bought my first Lipo - 10/10/2012 12:28 AM   
chase1


 

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Status: offline 		i meant 4s not 6s but anyway when i run mine from a full charge my car will run for about 1/4 its normal run time and the the car acts like its hitting lvc. when i plug the battery into the charger it shows 4.0, 3.8, 3.9,4.0 as cell voltages still. why is it going into lvc with that much voltage still in the battery? my lvc is set at 3.2.

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RE: Just bought my first Lipo - 10/12/2012 3:30 PM   
ElectricGuy007



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From: Owensboro, KY, USA
Status: offline 		I have not been racing lately so ive been putting my lipos in storage mode once per week.
I have 6 Lipo hardcase packs total so i tend to do all 6 of them.
7.60 is the storage charge voltage when i take the packs off the charger. This is what my Hitec X4 A/C Plus stops my packs at each time.
I usually let the charger stop not me stopping the charger. As soon as it beeps the pack is finished.

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RE: Just bought my first Lipo - 10/12/2012 3:44 PM   
john01374


 

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quote:

ORIGINAL: hindupimp2384

DAMN DAMN DAMN are you serious about damaging lipos if they are fully charged and sitting for 7 months on the self.  What ill the Lipos do and how can u tell if they are damaged cause.  i back into RC after 7 month break and my lipos balance and charge fine.  But its my car is laggy and full trottle sometimes.  i have 3 lipos and all are doing that now never has it been laggy. 




I’ve been running LiPo’s nowfor about 5 yrs and have talked to a number of people on the proper handling and storage etc etc. What I’ve noticed over the years is my LiPo’s have always come to me almost fully charged. The last four I bought we about 8.3V right out of the box.

I fully charge my LiPo’s regardless of how often they will be used. Doesn’t matter if it’s going to be an hour or over the entire winter. What I will do is about once a month I’ll take each pack out and plug in the balancer and check the voltage. This keeps the cells even and everything safe.

In all the years of doing this I have never seen any negative affects from how I treat or store them. Most of my packs give me around 300 runs before I notce any change in performance or significant run time.

I wouldn’t sweat it..


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RE: Just bought my first Lipo - 10/12/2012 3:48 PM   
EXT2Rob



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quote:

ORIGINAL: chase1

i meant 4s not 6s but anyway when i run mine from a full charge my car will run for about 1/4 its normal run time and the the car acts like its hitting lvc. when i plug the battery into the charger it shows 4.0, 3.8, 3.9,4.0 as cell voltages still. why is it going into lvc with that much voltage still in the battery? my lvc is set at 3.2.


I sort of sounds like maybe you have something that is causing a heavy load (drain) on the batteries.  Sometimes when a steering servo is starting to crap out, it'll draw a LOT of current, which will lower the voltage, and that could trick your LVC.  Of course, the worst case is that the LVC circuit in your ESC is going bad for some reason.  But I don't know that I've ever heard of that happening.



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