Lipo repair

[lincpimp]

Originally Posted by bensf

I bet you can't work your magic on these.

Looks like you have 1 good cell, bottom one on the left pack... Othwise they may be gone...

Now you can try flattening the ends back and resealing them... I have am in the process of testing this on a torn cell... I am not in the charging phase yet so try at your own risk!!!!
I will post back results...

Originally Posted by lincpimp

Looks like you have 1 good cell, bottom one on the left pack... Othwise they may be gone...

Now you can try flattening the ends back and resealing them... I have am in the process of testing this on a torn cell... I am not in the charging phase yet so try at your own risk!!!!
I will post back results...

They are all punctured. I'm just going to trash them. Its not really worth it to try and keep them. I only paid 50 or so for the set. I might wait an see what happens to your packs though.

[redshift]

Linc I'd like your input on this- first off, I was under the impression that the Maxamps 2S 6000 were a 2 cell, they're 4 with 2 paralleled. So my first thought is how the hell can you balance these at all with their setup

So I ran my packs down to about 7.1 on one run- not even close to cutoff, they flatten out enough that it's noticeable anyway but sure enough one is a little swelled- kinda knew it'd come with all the fun stuff I've read about Maxamps, but still it blows- especially considering I had to send 2 packs back a few months apart to GET two packs that were good. The first order one pack was at 4.2v, went back immediately, then a few months went by and the third one wouldn't balance, it was long enough that they felt the need to charge me more for the fourth replacement, so I paid around 3 bills for two packs- don't I feel smart for not finding RCM sooner..... the real issue was fitment in my mute, it was built for 6 cell packs and I had few options, but never again...

Anyway rant over, do you think this is ok to trial run? I charged it up full and it is balanced, but I wonder if it's worth trying. The other thing is these like peckmarks around the perimeter of the puffing, have you seen that alot? And the bottom cell seems very slightly puffed, should I just dispose?

[lincpimp]

Originally Posted by redshift

Linc I'd like your input on this- first off, I was under the impression that the Maxamps 2S 6000 were a 2 cell, they're 4 with 2 paralleled. So my first thought is how the hell can you balance these at all with their setup

So I ran my packs down to about 7.1 on one run- not even close to cutoff, they flatten out enough that it's noticeable anyway but sure enough one is a little swelled- kinda knew it'd come with all the fun stuff I've read about Maxamps, but still it blows- especially considering I had to send 2 packs back a few months apart to GET two packs that were good. The first order one pack was at 4.2v, went back immediately, then a few months went by and the third one wouldn't balance, it was long enough that they felt the need to charge me more for the fourth replacement, so I paid around 3 bills for two packs- don't I feel smart for not finding RCM sooner..... the real issue was fitment in my mute, it was built for 6 cell packs and I had few options, but never again...

Anyway rant over, do you think this is ok to trial run? I charged it up full and it is balanced, but I wonder if it's worth trying. The other thing is these like peckmarks around the perimeter of the puffing, have you seen that alot? And the bottom cell seems very slightly puffed, should I just dispose?

Hmmm, your pics are not really clear enough, can you take a pic on the side of the pack so I can see how puffed the cell is?

As for paralleled cells, they will work properly if and only if they are matched correctly. Maxamps told me they matched their cells, and I say that they are full of shite. I had a tech at flightpower explain their multi step matching process...I doubt that maxcraps has anything like that.

So my advise is to sell the maxamps packs that are still good. If your setup is ok with those packs, a pair of trakpower or other decent enerland hardcase packs will do fine, even at around 5000mah. Those will outperform the maxamps 6000 packs, which are 15c packs at best.

Stay away from parallel packs, only decent ones I have seen are the true rc 8000 packs.

They most likely puffed due to over discharge, and poor matching. The weak cell in the paralleled pair could not handle the discharge amps and most likely puffed due to that.

[redshift]

The photo on the left is the upper cell, pic may have exaggerated the puffng a bit, it's about 1/8 inch, and about half that on the lower cell.

[kulangflow]

It is likely that some of the swelling has actually gone down already. My MA packs usually swelled big, then deflated over time, only to swell again upon use. Dangerous game to play, I know. :-)

[redshift]

It actually has stayed the same kulangflow, which is why I am (stupidly?) considering trying it, I am in denial--- these packs have less than 30 cycles on them and I have treated them like china... grrrr I don't want to put .22 holes in this pack yet!

But then I do- knowwhatImean?

[lincpimp]

Well, once they puff they are done. You can try running it, but it puffed for a reason, so you will most likely puff it more.

Like I said, sell the good one, and you can send me the bad one and I can make a 3s 3000 pack out of it and then you can sell it too, or use it in something low draw. That way you can get some money back out of them.

You really need better packs, as your setup is most likely too potent for those 6000 packs.

[kulangflow]

Originally Posted by lincpimp

your setup is most likely too potent for those 6000 packs.

Almost any setup is too potent for those older 6000 packs, IMO. I hear the newer ones are much better though.

[lincpimp]

Originally Posted by kulangflow

Almost any setup is too potent for those older 6000 packs, IMO. I hear the newer ones are much better though.

Jason from maxamps told you that, huh...

[kulangflow]

Originally Posted by lincpimp

Jason from maxamps told you that, huh...

Nope, Austin. He said they have a totally different source and that they are a big improvement in cell quality. While Jason and I are "less than best friends", Austin and I get along pretty well.

Austin had sent me a 25C 8k pack and it was significantly better than the previous "20C" packs. Who knows about the rest of them? I don't see myself putting any money into their lipos anytime soon, but I am hopeful that the new packs are as good as advertised for those who do purchase them.

Here is some info from the actual PM's:

"It is a different source that the new cells are coming from, yes. We actually will be upgrading all the cells to 30C over the next month or so. The 3000s will become 3250 30C cells(with no increase to price by the way). They will be followed by the 5000 cells, then the 4000 cells.

We tested them at 30 and 35C. They get about 2500mah at 35C constant and almost 3000mah at 30C constant with good temps. They are a winner. Its the best 3000 cell we have ever tested by far.

Lets see... at 35C it would last a little over a minute the way I figure it. I am thinking that there will not be many guys running it at even 30C constant for the 2 minute run time.

Bottom line is that voltage under load will be very high and it should not hit cut off under a short high amp load.

-Austin"

Love them or hate them, it's always nice to see improvement.

[redshift]

Alright linc, I may or may not run it, but I have had the official warning so thank you.

As I said I bought those packs because they are the same size as a standard 6 celler, and admittedly knew next to nothing about lipos when I got them last March. I've learned TONS since then and much of that info has come from you and other members here. I do have two EVO25's that work great, but they are also $120 a pop, I am eyeing the new Hyperion Sprint 4000 packs which are half the price, I will probably buy 4 of those so I can have 3 pairs. I do have someone in mind with a Slash who I can unload the good MA pack on, and I think this bad pack will be going out in a blaze of non-glory.... charge it-short it-shoot it lol I may even get video..... Thanks much for the info.

I will refer any repairs in the future to you linc. I just hope people will avoid MA altogether and not have the buyers remorse- it really stings....

[lincpimp]

Originally Posted by kulangflow

Nope, Austin. He said they have a totally different source and that they are a big improvement in cell quality. While Jason and I are "less than best friends", Austin and I get along pretty well.

Austin had sent me a 25C 8k pack and it was significantly better than the previous "20C" packs. Who knows about the rest of them? I don't see myself putting any money into their lipos anytime soon, but I am hopeful that the new packs are as good as advertised for those who do purchase them.

Here is some info from the actual PM's:

"It is a different source that the new cells are coming from, yes. We actually will be upgrading all the cells to 30C over the next month or so. The 3000s will become 3250 30C cells(with no increase to price by the way). They will be followed by the 5000 cells, then the 4000 cells.

We tested them at 30 and 35C. They get about 2500mah at 35C constant and almost 3000mah at 30C constant with good temps. They are a winner. Its the best 3000 cell we have ever tested by far.

Lets see... at 35C it would last a little over a minute the way I figure it. I am thinking that there will not be many guys running it at even 30C constant for the 2 minute run time.

Bottom line is that voltage under load will be very high and it should not hit cut off under a short high amp load.

-Austin"

Love them or hate them, it's always nice to see improvement.

Nice that they will not increase the price... I wonder why?

Originally Posted by redshift

Alright linc, I may or may not run it, but I have had the official warning so thank you.

As I said I bought those packs because they are the same size as a standard 6 celler, and admittedly knew next to nothing about lipos when I got them last March. I've learned TONS since then and much of that info has come from you and other members here. I do have two EVO25's that work great, but they are also $120 a pop, I am eyeing the new Hyperion Sprint 4000 packs which are half the price, I will probably buy 4 of those so I can have 3 pairs. I do have someone in mind with a Slash who I can unload the good MA pack on, and I think this bad pack will be going out in a blaze of non-glory.... charge it-short it-shoot it lol I may even get video..... Thanks much for the info.

I will refer any repairs in the future to you linc. I just hope people will avoid MA altogether and not have the buyers remorse- it really stings....

Dude, don't shoot it! I can make you a pack, or I will give you something for it if you send it to me. If you do shoot it you may as well shoot a tree. Nothing will happen. Over charging will make a bunch of smoke, thats it.

Not as fun as you may think.

[redshift]

Way to steal my thunder- Doh!

I'll be pming you linc, something is better than nothing for sure.

[lincpimp]

Ok, so a member here sent me a few packs and I thought one would be interesting to disect and show my wonderful viewers what it looks like.

This is a maxamps 6000 2s lipo. It is a 2s2p configuration of 4 3000mah cells.

Note the non-rectangular shape, this is due to puffing of at least one of the paralleled cells. I will disect it and take some more pics as I go.