How to convert 3S lipo to 2S

[blueangel]

I need to get 5 packs of lipo converted from 3S to 2S configuration, i.e. from 11.1V to 7.4V.

Any idea if this is going to be easy ? How do you do it ?

If not, can I get a step down device to step the voltages down to 7.4V ? What device can do it cheaply ?

[zattan22]

you have to open the battery wrapings!!
and but the 2s pin lor..

you got to be good in shouldering!!

[blueangel]

you have to open the battery wrapings!!
and but the 2s pin lor..

you got to be good in shouldering!!

No problem with soldering by me.. but didn't want to risk opening up before finding out how to do it..

So I guess its pretty straight forward ?

Question for me is, it is a 3S.. so I presume it has 3 stacks of cells inter-connected ? So it is as straight forward as clipping off wires, leaving just 2 cells intact and then resoldering them back onto the charge leads and balancing leads ?

[skyblueblue]

i think most of the time the battery tabs are aluminium, impossible to solder. I wouldn't do it unless the cells are dead.

i would just sell the 3s and buy new 2s

[14 Blades]

I did crash my plane and one of my the cell in my 4 cells LIPO is dead.. I open the wraping and desolder off one dead cell.. pretty easy.. converted 4 cell to 3 cell the difficult part is getting another 3 cell balancing connector(white), have to savage from a dead 3 cell Lipo.. and the cell + & - must be correct...

Then come another headache... how you warp back the lipos?..

Can use the Bamboo plastic wraps...

[Sunstorm]

No problem with soldering by me.. but didn't want to risk opening up before finding out how to do it..

So I guess its pretty straight forward ?

Question for me is, it is a 3S.. so I presume it has 3 stacks of cells inter-connected ? So it is as straight forward as clipping off wires, leaving just 2 cells intact and then resoldering them back onto the charge leads and balancing leads ?

Why you want to do such a thing? So drastic. You converting to car, is it?

[zennith]

http://www.youtube.com/watch?v=MqywKcJ0J2M&feature=PlayList&p=9C113E4E6A30A00E&playnext_from=PL&playnext=1&index=47

big lipo pack is made.

http://www.youtube.com/watch?v=vZpYqhx6scw&feature=PlayList&p=5F3F1DAAA189CEA2&playnext_from=PL&playnext=1&index=46

small pack

http://upload.ecvv.com/upload/Product/20094/China_Lithium_Polymer_battery_with_capacity_1100mAh200942117582110.JPG

Single lipo pack

[zennith]

a beginner guide of lithium polymer...explain

http://www.youtube.com/watch?v=-DxJEx19x8U&feature=PlayList&p=D4CFF25EC2D08A8F&playnext_from=PL&playnext=1&index=24

[zennith]

DO IT AT your own risk... buy more life insurance before doing this...

By the way I sells insurance too...

http://www.youtube.com/watch?v=t2cJ49EoxDE&feature=related

[Babylon5]

DO IT AT your own risk... buy more life insurance before doing this...

By the way I sells insurance too...

http://www.youtube.com/watch?v=t2cJ4...eature=related

Wow, Zennith what a way to sell life insurance. Yes, to people who wants to dabble in lithium batteries, please buy some kind of insurance. Heh!heh!heh!

Cheers

[blueangel]

Why you want to do such a thing? So drastic. You converting to car, is it?

Yup..

Convert to car, dont want to make my car a frying pot of melted black cheeze..

Unless there's some step down devices I can just plug it in.. that might also settle my issues.

want to convert because I had 5 such lipos with 3S and I really dont want to sell them away..

[skyblueblue]

Yup..

Convert to car, dont want to make my car a frying pot of melted black cheeze..

Unless there's some step down devices I can just plug it in.. that might also settle my issues.

want to convert because I had 5 such lipos with 3S and I really dont want to sell them away..

Get a ESC that can handle 3s

[blueangel]

Get a ESC that can handle 3s

Nobody can sponsor me the new ESC yet..

[$h@d0w]

Something similiar to what you are doing.... http://www.rctech.net/forum/electric...w-do-i-do.html.

To remove the double sided tape sticking to both cells, pour lighter fluid over it and let it soak for a while, maybe 3-5mins. Get a used credit card to "slice" the double sided tape apart. You should be able to get them apart. This was taught to me by zennith.

[etman]

I have bad experience with Lipos.
I was trying to attach a JST plug to a 1s lipo and it shorted out.
It burned very hot. OMG!
That was only the leads.

IMHO, not a good idea to open a lipo and mod it.
Your house got insurance?