Lipo repair

To pull this thread back on topic. I have a Zippy lipo which I bought a while back and have yet to use, just whacked it on the charger to see what's up and one of the cells is does not look too good.

1.02v
3.81v
3.80v
3.81v
3.81v

It is a 5S 4000mah. Is there a way to resurrect the flat cell? What is the recommended procedure?

[Metallover]

Oh jeez... Is it puffed?

[lincpimp]

Originally Posted by anson

To pull this thread back on topic. I have a Zippy lipo which I bought a while back and have yet to use, just whacked it on the charger to see what's up and one of the cells is does not look too good.

1.02v
3.81v
3.80v
3.81v
3.81v

It is a 5S 4000mah. Is there a way to resurrect the flat cell? What is the recommended procedure?

Isolate the cell and slowly charge it. Not sure what charger you have, but A carefully watched nimh charger usually works well. Charge at a low rate, like .3amp until the voltage gets up to 3v or so. Then swap back to a lipo charge until it gets to around 3.8v. Then charge the pack as you normally would and balance it at the same time. Let it sit for a day or so and then check the cell voltages. If the bad cell is loosing voltage you may want to trash or reconfig the pack.

Cool thanks for the advice.

The pack does not look puffed, or any different to the 3 others that I have (all fine).

I will try and isolate the pack and do a nimh charge. I have a Hyperion 0610i charger. Is there a way to charge it using the balance taps? Or do I have to open up the packaging to get at it.

[lincpimp]

You can charge thru the balance taps, but not over 1 amp as the wires are a bit thin. Just find the 2 wires, pos and neg that go to that cell, use a multi meter to figure that out. Ten either use a female tap with wires to attach to the charger or unplug the 2 wires from the tap and use alligator clips, be careful not to touch them together.

Alright no problems, I have the needed connections and wires, so will give it a shot tonight.

If the cell doesn't work out, I will probably end up sending it to you to deal with like last time.

[lincpimp]

Originally Posted by anson

Alright no problems, I have the needed connections and wires, so will give it a shot tonight.

If the cell doesn't work out, I will probably end up sending it to you to deal with like last time.

No pob, hope you have good luck with it, just do not leave it unattended while you try to restore it...

[lincpimp]

Here a quick pic of some lipos I just finished. The 4 on the lest are a broken up 10s pack- 2 2s and 23s packs. The other 2 were packs with one damaged cell that I removed.

[_paralyzed_]

Linc-
My buddy made me a parallel adapter. I hooked up one side to my MMM. It turned on. It was nice. I unplugged the battery and plugged it into the other side. *poof* Magic smoke. The adapter was mis-wired. Thankfully (don't know how) the MMM survived. The smoke came from the battery pack. I assume a main pack lead burnt, or atleast cooked a little. No swelling. I haven't volt metered it or anything, It just scares me now. Even if I open it up and find (or don't find) a problem I don't have the stuff or ability to reshrink it. I think it desires to be stripped and man handled by you. PM me your addy if you're up for another lipo repair.

It's a 15c 6s 5000mah flightmax. Slightly cooked.....

[brushlessboy16]

Just check voltage on the cells and everything- if it checks out then your good to go- no repair needed...

I think you just want linc to manhandle your junk

[_paralyzed_]

smoke came out. even if it's "good" I don't trust the solder joints anymore. It needs to be opened and inspected. Once opened, I don't have shrinkwrap, a heatgun, or desire to shrinkwrap a pack. I have the worst f'ing luck with this stuff. Dozens of trucks and thousands of dollars spent and maybe an hour runtime...................................... Frick!

And you're right about the last part........

[_paralyzed_]

Linc-


Post #339^^^. Read please.

[_paralyzed_]

Liiiiiiiinnnnnnnnnccccccccc? Helllllloooooooooo

[_paralyzed_]

Lincy Poo?

[rawfuls]

I think Lincy poo went night nighty for a long time..