LIPO battery issues

[Loganr1]

Hey I have an 7.4 volt 5000mah 25c onyx lipo battery and I have an onyx 235 charger. I can't charge it cause I'm scared I havent set it up right u have read all instructions but last lipo I had blew up and almost burned down my house, I had everything set up right to can someone tell me how to set it up so it will charge good and have a long battery life?

[Loganr1]

Also it says to have the output voltage set at no higher than 4.2 bolts per cell but I can't change that in the onyx 235 and it says input voltage is 12.73 volts I can't figure out how to change it.

[Charlie-III]

Input voltage is what goes INTO the charger, has nothing to do with what goes INTO the battery pack.

To charge a pack, set to chemistry (LiPO), cell count (2S), charge rate (1C is normal, 5amps for a 5000mah pack = 1C) plug it in & let her rip.

If in doubt, put the pack in a LiPO sack, large coffee can, back porch on cement, driveway, etc. before charging. Then, "if something happens" nothing but the pack will burn.

[Loganr1]

Ok thanks but how do I change my output voltage ??

[indiana mudcat]

When you set it for 2s it sets the output voltage to 8.4v (4.2 per cell). Punch in 5000 for the capacity and it'll set to 5 amps (1c).

[Loganr1]

Ok thanks so it should be ready for charging once I do that also I am wondering if you can tell me how to properly discharge the battery

[Charlie-III]

Originally Posted by Loganr1

I am wondering if you can tell me how to properly discharge the battery

Put the battery in a rig, run until LVC stops the rig.
Done.

Don't overthink this stuff.

[Loganr1]

But the battery is only 7.4 volts isn't 8.4 volts to high?

[Charlie-III]

Originally Posted by Loganr1

But the battery is only 7.4 volts isn't 8.4 volts too high?

No....no....no.....no......

The 7.4 volts is a "nominal" voltage, not what it needs to charge at.

[Loganr1]

Ok so it is charging now and its output voltage is 8.04 volts

[Loganr1]

It says it's done but it only charged 1864 mahs out of 5000 could it be partially charged out of the box??

[indiana mudcat]

Ya, they come with some charge in them. Just make sure the LVC is on on your ESC and run it.

[Loganr1]

Ok thanks I'm running this in my LCC and can't get any torque I have a 12 tooth pinion and 45 turn motor I have tried 18 tooth and 27 turn motor but nothing works

[Charlie-III]

Originally Posted by Loganr1

OK thanks I'm running this in my LCC and can't get any torque I have a 12 tooth pinion and 45 turn motor I have tried 18 tooth and 27 turn motor but nothing works

For torque you want a high turn motor or smaller pinion.
If you had issue with the 12tooth pinion on the 45T motor, then changed to a 18tooth pinion with a 27T motor you went the wrong way on BOTH.
The 27T motor is a bit hot (fast) for a crawler.

Are these new motors or old?
What battery connectors?

You may want to look in the LCC forum to see what they recommend for motors & gearing.
Additionally, IIRC, the LCC is a worm drive axle, they tend to eat brushed motors very fast. Most recommend to run a brushless system.

If you've run both these motors for some time in the LCC, you may have used them up.

[Charlie-III]

Originally Posted by Loganr1

It says it's done but it only charged 1864 mahs out of 5000 could it be partially charged out of the box??

Yes, they have some charge (zero volts is a dead pack........).

How long did the charger run? I know when I balance some of my packs I hit the 120 minute time limit & have to restart the charge to get to the voltage limit.

[Rock_Diggn_Don]

Originally Posted by Charlie-III

Put the battery in a rig, run until LVC stops the rig.
Done.

Don't overthink this stuff.

Hey Charlie how you doin today , got a lipo ? , i have a 2s 2000ah 20c that i installed in my xr10 some how the LVC i set in my FXR didn`t cut it off , it`s now down to 4.7 v output ,my charger will not charge it now , is there any way to save this battery or did i kill it .

Thanks
Don

[j-bird]

Originally Posted by Rock_Diggn_Don

Hey Charlie how you doin today , got a lipo ? , i have a 2s 2000ah 20c that i installed in my xr10 some how the LVC i set in my FXR didn`t cut it off , it`s now down to 4.7 v output ,my charger will not charge it now , is there any way to save this battery or did i kill it .

Thanks
Don

I've done the same thing before.. I put my pack on slow balance for a while and it brought my pack back up enough to charge.. If your charger has a balancer try that .


J-bird

[Rock_Diggn_Don]

Originally Posted by j-bird

I've done the same thing before.. I put my pack on slow balance for a while and it brought my pack back up enough to charge.. If your charger has a balancer try that .


J-bird

Thanks J, i bought a thunder ac6 balance charger should be able to do that np. UPDATE my charger still gives me the same error message LOW VOLTAGE, and will not charge this battery , what kind of charger do you have J ?

[Charlie-III]

Originally Posted by Rock_Diggn_Don

Thanks J, i bought a thunder ac6 balance charger should be able to do that np. UPDATE my charger still gives me the same error message LOW VOLTAGE, and will not charge this battery , what kind of charger do you have J ?

Hi Don, try charging your pack on a NiMH or NiCD 6 or 7 cell charge for a few minutes, then try the LiPO balance charge again.

You "may" bring it back, but it's life may also have been shortened.

PS, I'm fine, thanks for asking.

[Rock_Diggn_Don]

Ok thanks Charlie i will try that right now .

UPDATE it appears to working ,i have it set at 3a charge rate , is this a charge rate you reccomend or should i do this slower at a lower rate ?

2ND UPDATE Fixed and it`s now taking a balance charge on the lipo setting ,Thanks for the help guys !!!