RunRyder RC
 8  Topic Subscribe
WATCH
 1 page 934 views
Scorpion Power Scorpion Power
Helicopter
e-
Electric Battery-Charger-pSupply
› Lipo battery repairs
10-08-2016 06:11 AM  13 months agoPost 1
DennisH

rrApprentice

Baton Rouge​Louisiana USA

My Posts: All  Forum  Topic

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

PM  EMAIL  GALLERY  Attn:RR  Quote
10-08-2016 02:08 PM  13 months agoPost 2
moparherb

rrApprentice

Fulton, NY Syracuse​Thunderbirds

My Posts: All  Forum  Topic

Dennis, buy another battery.....

PM  EMAIL  GALLERY  Attn:RR  Quote
10-08-2016 03:49 PM  13 months agoPost 3
JuanRodriguez

rrProfessor

The Villages,​Florida

My Posts: All  Forum  Topic

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.....

PM  EMAIL  GALLERY  Attn:RR  Quote
10-08-2016 03:58 PM  13 months agoPost 4
cdrking

rrElite Veteran

Seattle

My Posts: All  Forum  Topic

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.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-09-2016 03:05 AM  13 months agoPost 5
DennisH

rrApprentice

Baton Rouge​Louisiana USA

My Posts: All  Forum  Topic

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

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2016 09:35 PM  13 months agoPost 6
Rojoalfa

rrApprentice

Punta de Mata,​Monagas-Venezuela

My Posts: All  Forum  Topic

/
/

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,

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-22-2016 10:10 PM  13 months agoPost 7
ICUR1-2

rrElite Veteran

Ottawa, Ontario

My Posts: All  Forum  Topic

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

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2016 07:16 AM  13 months agoPost 8
DennisH

rrApprentice

Baton Rouge​Louisiana USA

My Posts: All  Forum  Topic

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

PM  EMAIL  GALLERY  Attn:RR  Quote
02-25-2017 01:16 PM  9 months agoPost 9
motorrc

rrApprentice

canton ohio usa

My Posts: All  Forum  Topic

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.

PM  EMAIL  Attn:RR  Quote
02-25-2017 07:20 PM  9 months agoPost 10
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

"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, 800XX, TDR IIs

PM  EMAIL  GALLERY  Attn:RR  Quote
03-12-2017 11:28 PM  8 months agoPost 11
DennisH

rrApprentice

Baton Rouge​Louisiana USA

My Posts: All  Forum  Topic

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

PM  EMAIL  GALLERY  Attn:RR  Quote
04-08-2017 06:53 AM  7 months agoPost 12
betty

rrNovice

Shenzhen

My Posts: All  Forum  Topic

They are so many sad stories about using damaged lipo.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-08-2017 01:58 PM  7 months agoPost 13
Pistol Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

This has been a very windy week so no flying until later today.

I spent an hour Wednesday downgrading 4 packs.

One 6S is now a 5S that will still be used in a heli.
Three 5S are now 4S and delegated to plane duty.

They are all charged and ready for action.

Its easier if the cell being removed is either the first one (most of the time) or the last one.

The ones in between are the ones that will "get you" if you are not careful.

Interesting to discover is how diffrent brands are assembled and the materials used such as ALU plates, rubber and or foam isolators at the busy end.

* * * * *
Betty...Welcome to RR.

Are you in the battery industry?

~~Enjoying the hobby one flight at a time~~

PM  EMAIL  HOMEPAGE  GALLERY  BLOGAttn:RR  Quote
04-08-2017 06:40 PM  7 months agoPost 14
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

?????

Logo 600SXs, 800XX, TDR IIs

PM  EMAIL  GALLERY  Attn:RR  Quote
04-08-2017 10:31 PM  7 months agoPost 15
DennisH

rrApprentice

Baton Rouge​Louisiana USA

My Posts: All  Forum  Topic

Interesting to discover is how different brands are assembled and the materials used such as ALU plates, rubber and or foam isolators at the busy end.
Yes, very true.

Where do you get the rubber/foam insulators?

What do they use for a bonding agent between the cells?

You must be on top of your toes when working on any of the middle cells. It's just worth it. Well, you must be on your toes when working on any part of the LiPo's. Very Dangerous, even the small LiPo's.

Dennis

PM  EMAIL  GALLERY  Attn:RR  Quote
04-12-2017 09:45 AM  7 months agoPost 16
betty

rrNovice

Shenzhen

My Posts: All  Forum  Topic

Yes, I am in the battery industry.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 934 views
Scorpion Power Scorpion Power
Helicopter
e-
Electric Battery-Charger-pSupply
› Lipo battery repairs
 Print TOPIC  Make Suggestion 

 8  Topic Subscribe

Saturday, November 25 - 4:10 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online