Ok no prob. Take your time. Thanks

I seem to be taking my time!!!! Sorry, I have so much laying around that sometimes boxes get shuffled away. I try to keep the lipos in the box that they shipped with so I have all of the info together. I will make some time this weekend and get a look at them.

Okay

Took a quick look at your lipos just now Hardstyle.

Seems like one of the robbe lipos is a bit out of balance. The other seems ok. Did you fully charge.balance them before you sent them to me?

One of the maxamps lipos has a small amount of damage to it on the end. Otherwise they seem to be hold voltage reasonably well. What did you sue them in? Did they puff on you a bit under load?

Linc thanks ordered the connector...

No prob, they usually ship quickly.

You said not to charge them before sending them so I didn't. I have stored them always fully charged and balanced. There's now about half years iirc from charging them.

Robbe lipos swelled quite much when I used them in my boat about 2 years ago. Haven't used them since, just charged them time to time.

Same thing twith MA lipos, both puffed. The other one which has electrical tape on it puffed more. And last time I test it it puffed again, but not so much was using it parallel 16000mah 11.1V

But thats odd you didn't notice anything else than miss balancing in the cells..

Try pressing that Ma lipo where's electrical tape, does it feel a little soft to you?

You can test drive them if you like or got time.

But if you can't find anything to fix with them you can sell them and split the moneys or something.. But I have seen my own eyes all of them puffing and only the MA lipos I have used in extreamely rare cases after that. Puffing I don't mean it has swelled to a balloon but so that it is noticeable..

Hope you get something from that :tongue:

Edit:.
Puffing was the reason to move on A123 batterys, but now Im thinking trying lipos again, I think Im old enough and learned my lesson :mdr::mdr:

Ok, I will put a load on the MA packs, those usually have a bad cell or 2 that cause the puffing. I figured as much, but wanted to hear your experience. Guess I get to remove the shrink and test the cell pairs individually. Sounds like fun, huh...

This is why I dislike packs with paralleled cells. Unless they are all exactly matched, you generally end up with problems. And maxamps matching process (or their quality control while building the cells) is lacking... Alot of people have these problems.

I am not familiar with the robbe packs, but seeing that they are 12c packs, and 4200mah they are really only good for around 50 amps cont. What kind of boat were you running them in? Size, power system, prop, etc.

Sounds like a heck of a job, heh.

Have to be honest the robbe lipos are completely my fault, was new on the lipos/brushless stuff. I used them parallel in a 51" long boat with 6xl bk motor and with the biggest "spoon" which I could fit to the axle. Stupid huh, yes. But before that I had 4 of these packs and used them as a big 2 x 22,2V 4200 pack in parallel and of course with that 6xl motor. Very stupid, yes.. The other 2 packs died very oddly, no swelling or anything, they just go quiet. Maybe some solders joints melted, dunno. They did go for inspection to robbe, but didn't hear anything after that.

MA lipos... well they are just bad. Maybe the other one suffered for cold weather driving, but I did use covers on it.

Don't take life time job for these lipos, if they are ok to you. Do what you like to them, I prefer selling and splitting the moneys

Wow, not trying to be offensive, but that is one horribly wrong setup... :lol: No wonder why they are messed up.

Thanks :mdr: Did I mention that the boat was FAST as long as it didn't over heat :rofl: Like 10 secs. It was those first time experiments, everything had to be big and fast..

Wow, a 51" boat!!! That sounds like fun. I have a 55" boat with a 26cc 2 stroke in it. I bet that 6xl got hot, and no wonder the lipos died!

I will inspect the maxamps packs and get back to you. No idea what the robbe packs will sell for, but I can list them on one of the airplane sites after I test them.

Now I started to think over the robbe lipos are more than 2 years old maybe like 3 to 4. I weren't even a member here that time.

I still have that boat, hanging from the roof now. Have to put it in a shape some day. Its this one, very cool looking http://www.hydromarine.de/hm_20710.htm

Throw a BIG Neu in the boat and call it a day! 12s2p power, she's be a brute!!!

Yeah! Would be sweet. And nowadays plane controllers won't cost a fortune should be much cheaper to get it running than a few years ago.

But I dunno gasoline would be nice too, get more running time. But then I don't know much about them.