R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Thread Tools Search this Thread
Old 07-05-2007, 08:30 AM   #1
Tech Fanatic
SRBMOJO's Avatar
Join Date: Jul 2007
Location: ORANGE CO., CA
Posts: 977
Trader Rating: 67 (100%+)
Default soldering batteries

Long time watcher, first time poster. I am putting together some matched 6 cell battery packs with deans soldering bars, and am having trouble getting a good solder "weld" for lack of a better word. I have a Weller soldering station and seem to have trouble getting the bar to stick well, it seems that the flux is the only thing holding it on. Soldering iron gets super hot, it will melt a great pool on the bar but won't adhere it well to the cell. Any tips on prepping the cells or a better solder to use.

Any help would be greatly appreciated, I used the search function and could not find a thread on this topic.
SRBMOJO is offline   Reply With Quote
Old 07-05-2007, 08:33 AM   #2
Tech Regular
GymBeam's Avatar
Join Date: Mar 2007
Location: Losi|Novak|MuchMore
Posts: 434
Trader Rating: 4 (100%+)

assuming you have a hot enought solder iron 80w, you may need to sand paper the ends of the battery.

i use a dremel
GymBeam is offline   Reply With Quote
Old 07-05-2007, 08:39 AM   #3
McSmooth's Avatar
Join Date: Apr 2004
Location: Served Fresh Daily
Posts: 1,631

Rough up the ends of the cell a little with some sandpaper...it won't take much.

Then, put a small pool of solder on the end of the cell before you attach the bar. Again, it won't take much. Just enough so the solder will flow to the bar.

And try not to leave the iron on the cell for too long.
McSmooth is offline   Reply With Quote
Old 07-05-2007, 08:44 AM   #4
Tech Adept
Double Quattro's Avatar
Join Date: Apr 2007
Location: Clermont, FL
Posts: 120

I run my iron at around 700 for soldering cells. Try scuffing up the battery with some coarse sand paper before soldering.

What works best for me is to first get the iron really hot, melting a good amount of solder right on the iron tip then I use that "pool" of molten solder to heat up the cell. The hot solder conducts heat more efficiently than the iron itself. When applying the solder to the cell/battery bar, start by melting more to that aready hot pool and then onto the rest of the area. By that time the cell should be pleanty hot to melt the solder directly.

The trick is, the cell surface has to get hot enough to melt the solder on contact. If you just apply solder to the bar, you are probably going to get a cold joint on the battery which will not hold.

Hope this helps. I won't pretend to be a pro at this, but the above tips always work for me
Double Quattro is offline   Reply With Quote
Old 07-05-2007, 03:14 PM   #5
Super Moderator
Grizzbob's Avatar
Join Date: Feb 2002
Location: Sand Springs, OK
Posts: 2,922
Trader Rating: 2 (100%+)

All of the above are good things to do, but there's onemore thing to consider, exactly which eller iron do you have? I know a bit about some of their stations, & without the right tip it won't matter what you do, you won't get a good solder joint on a battery. What you need more than anything when soldering batteries is high heat & LOTS of surface area in the iron's tip. That surface area allows the heat to transfer QUICKLY, so the solder will flow & bond to both bar & battery without damaging the interior of the cell. Believe it or not, Weller's cheap 40 watt irons can actually work better for that than their $100 stations(because of the surface area of its tip, most of their stations are just not meant for big jobs, they're for small, circuit board level work, I know this because I use them at work myself, & they're just not well suited for heavy-duty work)......
Bob Seay
Tamiya TRF417, TA05v.2, TRF211XM, M-05ver.2R, XRAY X12
Go Pokes!!!
Grizzbob is offline   Reply With Quote
Old 07-05-2007, 03:52 PM   #6
Tech Fanatic
SRBMOJO's Avatar
Join Date: Jul 2007
Location: ORANGE CO., CA
Posts: 977
Trader Rating: 67 (100%+)

Thanks for all the replies, I don't have the model number in front of me, seems to me I paid around $80 for it. I'll try the wider tip.
SRBMOJO is offline   Reply With Quote
Old 07-05-2007, 10:08 PM   #7
Tech Fanatic
Join Date: Jun 2005
Posts: 900

Exactly what Grizzbob says, and make sure that the tip has a lot of mass - it is thick - as well. The wattage of the iron is almost meaningless, what is important is the size of the tip.

A large tip will hold the heat well, and not lose temperature fast. That is the key to a good 'weld' when soldering, not the wattage. Here is a 260w iron, but that tiny tip will lose heat straight away, and you won't solder any cells with it. Here is the 45W iron I use, and it is excellent.

Don't save dollars on a soldering iron, and damage your cells with too much heat. HTH
SlowerOne is offline   Reply With Quote
Old 07-06-2007, 08:21 AM   #8
Tech Fanatic
SRBMOJO's Avatar
Join Date: Jul 2007
Location: ORANGE CO., CA
Posts: 977
Trader Rating: 67 (100%+)

I have a 40 watt Weller, I installed a 3/16" wide tip, scuffed up the battery ends with sandpaper and got great results last night. Thanks for all the info.

SRBMOJO is offline   Reply With Quote
Old 07-06-2007, 11:51 AM   #9
Tech Master
Big B's Avatar
Join Date: Dec 2006
Location: Kent, WA
Posts: 1,154
Trader Rating: 4 (100%+)

Like everyone else has said scuff the ends with some sandpaper or a dremel, use a Weller Chisel style tip or one with a big flat surface, soldering batts is probaly my least favorite thing to do, but since I perchased the Weller WESD51 soldering station with the ETD tip it has been cake. Good Luck and if all else fails go to your local track and ask someone to help you
Traxxas Slash 4x4, Team Checkpoint TC-1030 Charger and Power Supply, Team Checkpoint Lipo Balancer
Big B is offline   Reply With Quote
Old 07-06-2007, 02:11 PM   #10
Tech Apprentice
Join Date: Jun 2007
Posts: 56

well, I don't know much and I just finished building six packs of batteries, and when I bend the battery the bar bends but doesn't come off :P, sand the ends with a 600 grit sandpaper and then put flux on it, put some solder on the end of the iron, and press it to the battery, it'll flux the solder on, and you can solder whatever you want on it easily.
Havoxx is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Best Soldering Iron for Batteries? RCpurplecow Electric On-Road 37 05-02-2008 02:13 PM
Soldering Batteries tc4 Australian Racing 10 09-23-2006 10:41 PM
Soldering batteries - help D_o_S Electric On-Road 21 02-27-2006 06:41 PM
Soldering batteries - gap or no gap? D_o_S Electric On-Road 11 02-26-2006 09:11 AM
Soldering Batteries AssociatedRacer Electric On-Road 3 03-15-2003 06:53 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

All times are GMT -7. It is currently 06:31 PM.

Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net

SEO by vBSEO 3.5.0