which lvc? - RC-Monster Forums

tallyram · **which lvc? -** 06.20.2006, 07:27 PM

i've been running my g2r for around a month now on 6s lipo with no lvc. today when i plugged in one of the batteries to my ice charger, an error message came up saying input voltage was lower than was supposed to be for the cell count.

1) what is the best lvc for my application?

2) did 1 cell get over-discharged? should i send it in for repair or get a newpack? thanks for any help?

squeeforever · 06.20.2006, 07:43 PM

Is a cell in the pack puffed up? If not, its pobably not damaged.

coolhandcountry · 06.20.2006, 08:19 PM

http://66.241.195.91/lithium/lithium.asp?path1=lithium
I ran one of these for a while.
You have to watch it when it starts to stutter if push much more it will go wide open reverse.
I not sure on if your cell is bad or not. It maybe damaged even though it is not puffed. IF you try to charge it make sure outside or in a good location just in case you get it chargeing.

tallyram · 06.20.2006, 09:40 PM

nothing is puffed, but my ice charger wont let me charge the pack. would it be worth it for me to send it in?

Sylvester · 06.20.2006, 09:44 PM

Have you tried charging another battery with your ice? If it works with the other battery than id probably send the pack in.

Gustav · 06.20.2006, 10:25 PM

Can't you select a lower cell count and charge it up enough so it will charge on the correct count,or put on a NiMH charge on a low amp setting for a few minutes to get the voltage up.

tallyram · 06.21.2006, 03:13 AM

my other identical pack charged up fine. i probably could charge it up with a lower cell count or a different voltage, but i'd rather not be the person everyone online is talking about, that burned his house down! i'll probably just send it in. thanks, tally.

jhautz · 06.21.2006, 04:49 AM

I'm using this one ( http://www.dimensionengineering.com/LipoShield.htm ) on an emaxx with 4s, a 9920 and a 9L. Works nice. When you reach the cutoff it won't allow you to accelerate quickly. It just kinda boggs down, but you can still drive it back in slowly.

I have also tried this one. ( http://www.fmadirect.com/detail.htm?item=1897&section=2 ) It didn't like working with the Warrior controllers. I tried it on both a 7020 and a 9920. It cut out randomly when the voltage was no where near the cutoff point, and the only way to get it back on was unplug all of it and replug. It could have been just me or just the one that I got, but if you are using a Warrior controller I would pass on this one.

I agree with you.... Just send it in to the manufacturer. No use taking the chance of bigger headaches.

But FYI. I had the same issue with an older 3s pack that I was using for a brushless rustler. I forgot to plug in the LVC and ran it down to far. I used a volt meter to check the voltage and it was just below 9V, at 8.9 something. The manufacturer stated a 2.6V minimum voltage per cell, but it was below what the charger thought was the minimum 3.0V/cell I assume). I did what they suggested above, set the charger for a 2 s pack. The charger recognized it and I charged it up a little bit using a real low amp setting (0.2A I think). Then when the voltage was above the chargers minimum, I reset the charger for the correct cell count and continued charging it at a lower than normal rate (1A I think).

It charged up and I never had another issue with it. Mind you, I set up the charger on a extension cord in the middle of a concrete driveway so if anything went wrong, the worst that would happen is a scorch mark on the driveway.

Please don't take this as encouragement to do it if you are not comfortable, But it may be worth a quick voltage check with a volt meter. And If you do, make sure you take the appropriate 'just in case' precautions..

jhautz · 06.21.2006, 04:55 AM

....

tallyram · 06.21.2006, 10:57 AM

that eased my mind a little, so i guess i'll try it! thanks for the info j.

tallyram · 06.21.2006, 11:29 AM

update: so far so good. i set the ice for a 2 cell count andit got the voltage up. its charging at 1a right now, cross your fingers! thanks again everyone!

MetalMan · 06.21.2006, 04:21 PM

Do you have a balancer or way to check individual cell voltages? It's possible that one cell may have a lower voltage than the others, which could cause the other cells to be overcharged, damaging them.

tallyram · 06.21.2006, 10:49 PM

no, its on backorder. been waiting a month for it.

jhautz · 06.21.2006, 10:56 PM

He's right. Balancing that pack is a very good idea. When you push a pack to its limit, it tends to imballance faster.

Sounds like you charged it up already. Howd it go?

tallyram · 06.21.2006, 11:26 PM

i won't use the pack until i get a balancer. the pack did charge to 12.6v just like normal. i'll probably bypass my lhs, which ordered the balancer, and get one along with a lvc online. i was really paranoid about charging that pack, but i'm glad you guys gave me good info, and i used caution with the info. looks like i got lucky this time!