Lipo repair

[rawfuls]

The Turnigy's are 20C...
Or is it 25....

[Metallover]

Thry have 20, 25, and 30c iirc.

[Jahay]

im bringing this post back from the dead....

Linc... i need some lipo help/advice. I do not have pictures of the lipo yet but hopefully you can just confirm the problem and then advice the course of action i should take once i get pictures up?

I have a hyperion G3 6500mah 35c 3s lipo.

Firstly i will say that my electrics are fine as the truck runs nicely with my other lipos... problems occur only with this lipo.

How it started:
Had a few bad landings with my truck one day... the next day, i plugged my lipo into the ESC, i got the beeps and was about to move. But then upon accelerating, the truck would stutter terribly. If i lifted the truck off the ground, and slowly acclerated then the wheels would spin just about... once the truck is back on the ground. I get problems.

i never had a problem with charging the lipo even when it was in this state.

So i then thought that the lipo probably had a solder break or a bad connection somewhere, possibly from a bad landing etc...

Now the lipo does not charge and reads error when charging, and i get no stuttering at all when i connect it as it doesnt even turn the esc on.

When i took all th shrink wrap off the motor, i could not see any obvious signs of solder breaks or anything? i will take pics and post them this evening, but i am wondering how you would approach the lipo in terms of fixing it?

Thanks a lot... hopefully you can help me out

Josh

edit...
This is how my motor behaves on this lipo. It sounds like it is cogging...
http://www.youtube.com/watch?v=MMS4q...yer_embedded#!

[brushlessboy16]

Originally Posted by Jahay

im bringing this post back from the dead....

Linc... i need some lipo help/advice. I do not have pictures of the lipo yet but hopefully you can just confirm the problem and then advice the course of action i should take once i get pictures up?

I have a hyperion G3 6500mah 35c 3s lipo.

Firstly i will say that my electrics are fine as the truck runs nicely with my other lipos... problems occur only with this lipo.

How it started:
Had a few bad landings with my truck one day... the next day, i plugged my lipo into the ESC, i got the beeps and was about to move. But then upon accelerating, the truck would stutter terribly. If i lifted the truck off the ground, and slowly acclerated then the wheels would spin just about... once the truck is back on the ground. I get problems.

i never had a problem with charging the lipo even when it was in this state.

So i then thought that the lipo probably had a solder break or a bad connection somewhere, possibly from a bad landing etc...

Now the lipo does not charge and reads error when charging, and i get no stuttering at all when i connect it as it doesnt even turn the esc on.

When i took all th shrink wrap off the motor, i could not see any obvious signs of solder breaks or anything? i will take pics and post them this evening, but i am wondering how you would approach the lipo in terms of fixing it?

Thanks a lot... hopefully you can help me out

Josh

edit...
This is how my motor behaves on this lipo. It sounds like it is cogging...
http://www.youtube.com/watch?v=MMS4q...yer_embedded#!

I had this problem with my 4 cell hyperion 6500, the front board(opposite the battery leads) cracks due to Nosediving and lawn darting- which breaks the connection- you have to reflow the solder joints.

I did this and the pack is back to its normal diff distroying self.

I also do lipo repairs if you need it

[suicideneil]

Do you have a digital multimeter to test with? You could check the main battery connectors/ wires to see if you can get a total pack voltage, and/ or check at the balance taps to try and locate a break somewhere or a dead cell.

[Jahay]

neil, i know i do not have any dead cells as a friend checked it on his multimeter. (i dont have one though)

BB16, if i was in the states i definitely would send you my hyperion to have a look at it, but considering im in the UK and need the lipo this weekend to run, i think i need to do it myself...

When you say the "front board" opposite the battery leads... which part do you mean? because i have battery leads on either end of my lipos which is different to all my other lipos.

I believe the damage was caused by a massive nose dive :( so i need this repaired...
Thing is, i cannot see any breaks or cracks in the solder... maybe i am not looking at the right place...
You do not by any chance have a pic you could post up? otherwise when i get home, ill post one for you to point out the area you are talking about...

Thanks for the responses guys.

[brushlessboy16]

Originally Posted by Jahay

neil, i know i do not have any dead cells as a friend checked it on his multimeter. (i dont have one though)

BB16, if i was in the states i definitely would send you my hyperion to have a look at it, but considering im in the UK and need the lipo this weekend to run, i think i need to do it myself...

When you say the "front board" opposite the battery leads... which part do you mean? because i have battery leads on either end of my lipos which is different to all my other lipos.

I believe the damage was caused by a massive nose dive :( so i need this repaired...
Thing is, i cannot see any breaks or cracks in the solder... maybe i am not looking at the right place...
You do not by any chance have a pic you could post up? otherwise when i get home, ill post one for you to point out the area you are talking about...

Thanks for the responses guys.

Take the heatshrink off the pack, the end that does not have the wires coming out.. Check all the older joints and the board.

My board was craked and bent... which pulled one of the solder joints apart..

Reflow all of the solder joints to ensure a good connection.

[Jahay]

i have taken the heat shrink off but i have wires coming out at either end... here are some pictures close up of either side. If you can spot something that i am completely missing, then please let me know and advice on how to sort the problem...

Thanks



In the picture below... is this metal part meant to be sticking out??? or should it be tucked in somewhere like the rest?







I hope these pictures help... As you can see there are positive and negative wires at either end and balance leeds connecting... i cannot see any cracks in the solder or obvious breaks. Is the flap that seems to be sticking out possibly the problem??

Thank you

Josh

[brushlessboy16]

Originally Posted by Jahay

I hope these pictures help... As you can see there are positive and negative wires at either end and balance leeds connecting... i cannot see any cracks in the solder or obvious breaks. Is the flap that seems to be sticking out possibly the problem??

Thank you

Josh

THat picture, left side, looks like a crack in the solder, hard to tell. Reflow those puppies- they look ghettooo(means alot coming from a black guy)


that metal peice is where the cell's aluminum tab is attached to the copper tab for soldering

Tuck it up out of the way

[suicideneil]

Hmm, it all looks okay more or less. The sticky out flap shouldnt be an issue, though Im wondering if the join it solid or not- just looks like its stamped together ( all the little dimples ). Im also looking at the other join on that end and wondering if that is solid too- might be worth doing a continuity test with the multimeter to find where the break is, though if its only intermittent it could be tricky...

[whitrzac]

OMG that looks like it was soldered by the same 5 year old kid that made my HC packs...

[Jahay]

i cant believe how rubbish the solder job is on this expensive hyperions!!!

BB16 i think i know what you are talking about...
should i remove the current solder? or just resolder over the top of it?

The aluminium tab... should i be soldering that back on to the copper tab or just tuck it tightly next to the copper tab?

Thanks for the help guys...

Can anyone recommend a decent, well priced multimeter?

[Jahay]

Hi, im back again as i still have the same lipo problem.

I tried my soldering iron to reflow the solder but my iron must be rubbish as it didnt get hot enough to melt it. Tried a friends iron and the same problem...

So before i go out and buy a new iron i used a volt meter to check the cells via the balance connector...

I DIDNT GET ANY READING!!!! all my other lipos give a reading... but this wouldnt?
What does this mean? can you work out where there is a problem? what the possible culprit is?

Please get back to me asap

THANKS A LOT

Josh

[V0RT3X]

Do you get voltage on the balance wires?

[Jahay]

no i dont :(