Lipo repair

[Jeremy1976]

Got my pack today. Thanks for rewiring it and shrink wrapping it for me. I got it all charged up!

[Metallover]

Where is the best place to get large shrinkwrap? I need some for multiple batteries. I am getting a zippy soon and I'm going to tape the cells together and I'll need to reshrink it along with my flightpower lipos. Hell, all my batteries need shrink.

Hobbycity helped me out with the wire shrink but I can't find any large shrink on there.

[squeeforever]

Originally Posted by Metallover

Where is the best place to get large shrinkwrap? I need some for multiple batteries. I am getting a zippy soon and I'm going to tape the cells together and I'll need to reshrink it along with my flightpower lipos. Hell, all my batteries need shrink.

Hobbycity helped me out with the wire shrink but I can't find any large shrink on there.

Max Amps has some in black and clear, and TrueRC has some in clear, red, yellow and purple.

[lincpimp]

cheapbatterypacks.com is where I get my black shrink. They ship fast, too. Never had a messed up order either!

[Metallover]

Originally Posted by lincpimp

cheapbatterypacks.com is where I get my black shrink. They ship fast, too. Never had a messed up order either!

Can to enlighten me on what size to get? I need to shrink my FP 3200mah 3s lipo which is comprable to a 6 cell stick pack. I also need to shrink a 4s 5000 my zippy after I get it and tape the cells together.

You don't need to take time to reseach all that crap, just tell me how I calculate the size I'll need and what sizes you use.

[sikeston34m]

Cut a piece of paper that will wrap all the way around the pack one time.

Measure the piece of paper. Example: 150mm long

Divide this number by 2: 150/2=75mm

Buy the size shrink that will fit your pack snugly BEFORE shrinking.

Remember the posted sizes on shrink are "lay flat" measurements.

Something like 83mm shrink will work well for this example.

Most shrink is 2:1 or 3:1 shrink ratio.

You can buy a heat gun but most of the shrink, I've dealt with, works well with the heat from a blow dryer on "high heat" setting.

When you actually shrink your pack, cut the shrink about 1" longer than the pack is. The shrink not only shrinks in diameter, it also shrinks in length.

I like to shrink each end for a snug fit first, then I go back and hit the middle of the pack with heat.

This tightens the entire thing up and makes it look good.

Practice makes perfect. Buy more than you need for a practice run or maybe two.

I hope this helps.

[lincpimp]

Originally Posted by Metallover

Can to enlighten me on what size to get? I need to shrink my FP 3200mah 3s lipo which is comprable to a 6 cell stick pack. I also need to shrink a 4s 5000 my zippy after I get it and tape the cells together.

You don't need to take time to reseach all that crap, just tell me how I calculate the size I'll need and what sizes you use.

The narrowest should do the smaller pack, next size up will do the 4s. This is for cheapbatterypacks list on their site...

[rawfuls]

I believe.. for my 6 cell pack, I used 68mm.

[lincpimp]

So I had a guy send me a couple of maxamps packs, 1 6000 4s and 1 8000 4s. When I took them apart, both sets of cells list 4000mah on them... Kinda weird. The 4000 listed cells out of the 6000 pack are slightly thinner than the 4000 cells out of the 8000 pack...

Just figured that I would throw that out, just seems strange. I am guessing that the cells out of the 6000 pack are lower c rated, as they are thinner.

Otherwise, it was all the same crappy maxamps assembly with super thin tabs and inflated ratings.

[squeeforever]

Originally Posted by lincpimp

So I had a guy send me a couple of maxamps packs, 1 6000 4s and 1 8000 4s. When I took them apart, both sets of cells list 4000mah on them... Kinda weird. The 4000 listed cells out of the 6000 pack are slightly thinner than the 4000 cells out of the 8000 pack...

Just figured that I would throw that out, just seems strange. I am guessing that the cells out of the 6000 pack are lower c rated, as they are thinner.

Otherwise, it was all the same crappy maxamps assembly with super thin tabs and inflated ratings.

Maybe the cells are just so sh!tty they won't take the full capacity so they call em 3000s instead of 4000s...

[lincpimp]

Originally Posted by squeeforever

Maybe the cells are just so sh!tty they won't take the full capacity so they call em 3000s instead of 4000s...

Either that or they are 10-12c cells and they can rate them as 3000 20c cells... Either way they are junk...

[skellyo]

You should have my 5S TP's in hand by tomorrow. They arrived in Slidell this AM according to the delivery conf #.

[lincpimp]

Since it has been a while since I posted some pics, I figured that I would photo document splitting up one of Skellyo's 5s packs into a 3s and a 2s pack.

Pack is a thunderpower 5000 5s 25c pack. Cells are enerland manufacture.

Heres a few going into the disassembly phase. Note that enerland cells have a large tab on each end, instead of side x side as most chinese (maxamps inc) cells do. The tabs are al, but are very thick, and at least twice as wide as a maxamps pack. I will scare up a maxamps cell and take a comparison pricture. Also note that the cells are arranged in series end to end, so on odd number cell packs one of the main leads must run down the inside of the pack in order for both main leads to exit at the same end. Also note the colorful tp style tap. Both thunderpower and flightpower use the same style tap, only the wire colors differ.

[lincpimp]

A few shots of the bare cell ends:

[skellyo]

Any updates?