RunRyder RC
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 1703 views POST REPLY
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Another one bites the dust
05-05-2010 04:16 AM  9 years ago
Kiba

rrApprentice

CA

MyPosts All Forum Topic
Last year I ordered 4 Turnigy 6S 5000's for a friend's Logo 500 and his Trex 700E conversion and two packs were bad out of the box-- one had one bad cell and one had two bad cells.

I robbed one cell out of the pack with two bad cells and used it to replace the 1 bad cell in the other pack.

At least on the packs I disassembled the internal resistances of the individual cells were written on the cells with a sharpie so it was easy to verify the new cell would be a good match.

It can be done but you need to be very mindful of where you're putting your soldering iron so you don't short any cells and you need to be quick so you don't put too much heat into the cells. The solder tabs & board is fairly heavy on the 5000mah packs so a higher wattage iron allows you to work more quickly. A low wattage iron requires too much dwell time to get the solder to flow and that means putting more heat into the cells.

I highly recommend having a vacuum desoldering tool and desoldering braid. Discharge the pack first... this will hopefully minimize the chances of a "kaboom" if you happen to short something. First, remove as much of the extra solder as you can. Then heat it up again and once the solder begins to flow use a small pick to "lift" the tabs off the PC board and hold them off the board until the solder cools. Use dental floss to "saw" through the double sided tape between each cell, then you can remove the bad cells. Tape off the tabs or cells you aren't working on and again, be very mindful of all the possible short points...
SHARE  PM  EMAIL  Attn:RR  Quote
05-05-2010 04:34 AM  9 years ago
big lou

rrNovice

ny

MyPosts All Forum Topic
ive replace cells i did it outside on a table. just note when soldering make sure you dont run solder to the other cell your asking for trouble. what i do i put a bead of hot glue between cells it keeps the solder from running this let u do nice heavy solder with min risk. if you do the repair you do it at your own risk.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
05-05-2010 04:59 AM  9 years ago
toolman18

rrElite Veteran

Portland Tx

MyPosts All Forum Topic
I think i can do the repair but ill need another cell. Not sure where to buy a cell. I have a really good solder gun but no desoldering bulb. The hot glue trick sounds good. And thanks for the discharging idea.

I only need to remove the third cell. Is it going to be a problem to just remove the one cell? I dont see why it would cause a problem. Just gotta make sure i hook it up just like it came off.

Another issue. After the repair i will want to put new heat shrink on it. Does anyone know where to find that?

Thanks for the help. Ill definitely put on the safety glasses for this one.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
05-05-2010 05:11 AM  9 years ago
Fnity

rrKey Veteran

Denver, CO

MyPosts All Forum Topic
Another reason to get good packs..... Anyhow be careful guys
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
05-07-2010 01:37 AM  9 years ago
USAF Retired

rrVeteran

North, TX

MyPosts All Forum Topic
Had a similar issue...the cost of a just buying a replacement pack outways the risk of a fire, IMHO...Safety First. Good Luck.

Terry
SHARE  PM  EMAIL  Attn:RR  Quote
05-07-2010 01:59 AM  9 years ago
Fnity

rrKey Veteran

Denver, CO

MyPosts All Forum Topic
6S soldering =
ThunderPower/Hyperion =
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
05-12-2010 11:10 PM  9 years ago
toolman18

rrElite Veteran

Portland Tx

MyPosts All Forum Topic
I decided not to solder the pack. I am still fighting with Hobby city. Hopefully they will do the right thing. I do not give up easy.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 1703 views POST REPLY
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Another one bites the dust
 Print TOPIC  Make Suggestion 

 6  Topic Subscribe

Wednesday, November 20 - 4:58 pm - Copyright © 2000-2019 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online