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› Lipo battery repairs
DennisH

Senior Heliman

Baton Rouge Louisiana USA

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How many people have changed cells in their 6s Lipo batteries?

Just curious.

After dismantling the cells, how do you check each cell to see which one is bad?

What material do you use to put the battery back together? Not the outer wrap, the cells look like they have shipping tape on them. I was wondering if this is a special tape?

Dennis

10-08-2016 06:11 AM
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moparherb

Senior Heliman

Fulton, NY Syracuse Thunderbirds

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Dennis, buy another battery.....

10-08-2016 02:08 PM
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JuanRodriguez

Elite Veteran

The Villages, Florida

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Frankly, in the wake of all of the reported lipo fires that have been well documented I can't understand why someone would want to repair a damaged lipo......

I'm sure you will get some replies such as, "I do it all the time without any problems"

But, your stuff, your house, etc......

Flame suit on

Been there, done that and old enough to know better.....

10-08-2016 03:49 PM
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cdrking

Elite Veteran

Seattle

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There is a guy at our field that does it often. I have taken batteries apart many times. I have not found replacement cells though.

I do agree that many shouldn't attempt it, BUT it's not rocket science either.

Jeff

To hover is divine, the alternative is rather PLANE.

10-08-2016 03:58 PM
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DennisH

Senior Heliman

Baton Rouge Louisiana USA

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I am an automotive technician, so I am use to tearing into things. The battery is simple.

OH, I do work on electric vehicles and am certified as well. Those batteries you "need" to be scared of! I use to teach classes on these vehicles, and have held several seminars with emergency personnel. These guys really need to know the vehicles before they pull out the jaws of life! I definitely know the hazards of LiPo Batteries.

I have seen where several do repair their batteries.

I am just getting opinions as I hate to throw away 5 good cells on a 6s battery.

If you have a certain process taping the cells back together (after soldering them together), I would be interested in your experiences.

Dennis

10-09-2016 03:05 AM
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Rojoalfa

Senior Heliman

Punta de Mata, Monagas-Venezuela

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/
/

Well, I like to "repair" faulty lipos... We pull the bad cell Out but not to install a new cell.
We do a conversion so, a 6s with one cell bad, you get several combinations... One pack of 5s or two 2s packs...

Lipos for Rx is your chance...or your starter motor for glow or gasser...

/

Saludos cordiales,

10-22-2016 09:35 PM
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ICUR1-2

Elite Veteran

Ottawa, Ontario

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Battery repair

unless the cells are IR matched and of the same age I would not repair.

You can however re purpose them by splitting into a smaller packs

I just use duct tape after and write down the pack size

they can be used for other things

spending time, paying attention

10-22-2016 10:10 PM
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DennisH

Senior Heliman

Baton Rouge Louisiana USA

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Good information above.

I really didn't realize how critical LiPo batteries are. It's very interesting.

IR's, I can check them, but I don't know if I can find one close to donate to a battery that needs one new cell.

I will stay safe vs. sorry.

Dennis

10-23-2016 07:16 AM
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motorrc

Senior Heliman

canton ohio usa

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the biggest problem I have had with lipos is the wires disconnecting from the cells, usually one of the balance wires. I am like you, I hate to throw away an otherwise good battery. I have just been re-soldering them and wrapping the whole thing with electrical tape. I have been doing this for years without a problem. I have not actually replaced a cell however.

if it doesn't fit, make it fit.

02-25-2017 01:16 PM
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EEngineer

Elite Veteran

TX

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"I really didn't realize how critical LiPo batteries are. It's very interesting."

It is, indeed....

With Lipo's, if the internal cell resistance of the replacement cell can matched, that's sufficient.

The problem I've had over the years is....not just with LiPo's, but with NiCad's, etc.....is in "soldering in" the replacement cell.

The heat of normal soldering is extremely detrimental to any battery, at best....

The wires are connected via a "spot-weld"....batts that have "solder tabs" have such tabs "spot-welded" to the batt itself(and act as a heat sink drawing soldering heat directly to the batt).

Spot-welding requires special equipment, unfortunately for us, but is the proper way to construct/maintain a batt pack.

And, if one cell has gone bad, might not the other cells be going bad too?

To risk a ~$1500(or more, with avionics) heli for a $100 batt is "penny wise and pound foolish", as the saying goes.

FWIW

Logo 600SXs, 700XX, 800XX

02-25-2017 07:20 PM
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DennisH

Senior Heliman

Baton Rouge Louisiana USA

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What's interesting or "scary", there's one company that sells individual "new" replacement cells for LiPo batteries.

It's almost giving the impression that repairing LiPo's is a normal process.

I have worked on many electrical systems, including the Hybrid Vehicles. I had trouble believing replacement of the LiPo cells are a normal process.

I definetly know the dangers of LiPo batteries.

I will stress to everyone, repairing or replacing cells in a LiPo battery is very dangerous and will happen (with fires) very quick.

This also applies to adding or changing connectors on the battery power leads. It's very easy to get one reversed.

If you buy a battery from another person, CHECK the polarity to make sure they installed the connector correctly.

Be safe,
Dennis

03-12-2017 11:28 PM
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