Lipo repair

[Slash Racer]

Always read the forums but never posted...

Anyways,

I have a 3s 4900 20C Rhino battery and when I charge it it only takes in about 1500 -1700 mah after I ran. I charged the lipo up again and ran it to about 11 volts where it started to slow down. The second time I charged it was on a hyperion that I borrowed to check the cells. It was fully balanced at the end of the charge. I ran it this time and it did the same thing. I was told to charge the individual cells and the mah added up to around 4500 but I did not run until cutoff and it only charged to around 1500-1700 mah again.

What a mouthful, but do any of you guys know what is going on?

Thanks,
Zach

[lincpimp]

Hmm, sounds like you have a bad cell on that rhino pack. Can you set your lvc to 3.2v per cell and give the pack a full run till the lvc kicks in? If the charger only puts back 1700mah that is all you have used, not even half of the pack...

[Slash Racer]

I did not mention that but it has always been set to 3.3 volts per cell. I ran it to cutoff the run before it only charged this much.

[Slash Racer]

When I charged it it does not even start charging at 4.9 amps like my other batteries do. It starts at about 4.2

[lincpimp]

You must have a bad cell. It is dropping voltage badly, and letting the pack voltage get low enough so that the lvc kicks. I can pull the bad cell out, or at least test the pack, but it may be cheaper/easier to just buy another pack, those packs are about 40 bucks new...

[Slash Racer]

I have a neu energy pack that should be here tomorrow but I was just seeing what could be wrong. I figured it might have had a bad cell. I have only had it since january and have only charged it about five times a week sometimes not using it some weeks.

[gimpygolden]

Originally Posted by lincpimp

Ahh, I see what the "gimpy" refers to... I give you alot of credit for having a sense of humor, not sure if I would be able to handle that myself. Respect! (said in Ali G voice)

Eh, I've got an awesome wife,7 month old twins(Grrr. go back to bed) 2 Good Dobies(kinda) and I still get to play with toys at my age.

Lifes to short to dwell on the speedbumps, you gotta keep on truckin'

[lincpimp]

Originally Posted by gimpygolden

Eh, I've got an awesome wife,7 month old twins(Grrr. go back to bed) 2 Good Dobies(kinda) and I still get to play with toys at my age.

Lifes to short to dwell on the speedbumps, you gotta keep on truckin'

Good way to look at it! Glad to hear you have a great family, that can cure all ills!

[riverat1540]

hey linc i got that 5s zippy 5000 pack h pack u fixed for me but my application in the muggy is too much for it and i puffed a cell pretty good it goes away but after i charge it and run it i comes right back and the pack is running hot, but i have a 10th scale staduim truck i was wondering what it would cost just to split the pack into 2 2s packs as im going to need a good pack for the muggy which has been almost bombproof on 5s but am looking to get a 1900kv motor rather than the 2200 and run 6s for less strain on the system

[hootie7159]

Linc,
your pretty good with soldering..(duh:)) and i was wondering if you knew how they made these...and if it could be done with the existing male/female plugs i have.....

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXNKY8

[lincpimp]

Originally Posted by hootie7159

Linc,
your pretty good with soldering..(duh:)) and i was wondering if you knew how they made these...and if it could be done with the existing male/female plugs i have.....

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXNKY8

I have made those before. Just tin all of the tabs, and figure some method to hold all 3 of the plugs together when you solder them up. Pretty easy.

[hootie7159]

do you use plasti-dip to insulate the joints as well???

[BrianG]

I made some adaptors similar to that and I just use hotglue to insulate them. Doesn't look the best, but works well. If it can't be fixed with duct-tape, then hotglue is the next best thing.

[nitrostarter]

Yep, as long as it insulated and doesnt allow shorting out, then it doesnt matter how ugly it is.

[lincpimp]

+1 on hotglue. I used epoxy for the first deans parallel adapter and it was a bitch to keep it where I wanted it to stay, kept running out. I like hot glue for various projects, especially sticking wheel weights on, works like a champ for that.