Sla battery terminal repairs

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Kerry
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Thu Aug 08, 2013 5:34 pm

A while ago there was a thread about the positive terminal breaking off a sla battery and weather it could be repaired. This week I broke the terminal on mine so it was the perfect chance to do a repair on it (I did the same thing with my last battery and got an extra one and a half years use out of it.)
1: Broken terminal
Battery repairs 001.jpg
2: Dig around the terminal with a knife and drill a small hole through the exposed bit of terminal (be carefull not to dig down too far)
Battery repairs 003.jpg
3: Take a peice of electrial wire and strip a bit of the insulation off. (around 20mm) Then slip through hole and twist back onto itself.
Battery repairs 004.jpg
4: Cover the wire and terminal with solder. (be carefull not to over heat the plastic around the terminal)
Battery repairs 005.jpg
5: cover the terminal with a sealant and put a terminal on the other end of the wire. I then tape the wire to the battery to stop metal fatiuge breaking the wire at the terminal. (I have left a fair bit of wire under the tape so when the crimp terminal breaks there is plenty of wire to put another one on - I find that I hace to replace the crimp terminal every couple of months)
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Battery repairs 006.jpg
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WaikatoYakka
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Thu Aug 08, 2013 5:38 pm

I have done exactly the same but not as tidy... good result.

After 18 months of use the bared back cable has corroded and the gauge of the cable is getting lighter but still functional.

When I get around to it I'll melt the solder out and re-do it.
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wet ass
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Thu Aug 08, 2013 5:40 pm

got 2 just like that and still going great after 2 years :y:
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Hairy Little Dwarf
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Thu Aug 08, 2013 7:50 pm

What I want to know is what are you guys doing to your SLAs to keep losing terminals???
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Thu Aug 08, 2013 7:54 pm

Getting them wet with saltwater I'd imagine, had a couple in the past like this but now my terminals get a frequent application of protection normally MS4.

I like the idea of the long wire you keep chopping back Kerry :y:
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Tara Yakka
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Thu Aug 08, 2013 8:10 pm

Hairy Little Dwarf wrote:What I want to know is what are you guys doing to your SLAs to keep losing terminals???
My thoughts HLD.
Also, why the need to replace the crimp every couple of months?

Apart from that, thanks for sharing Kerry. Good to know that it can be done.
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Stinky inky
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Thu Aug 08, 2013 8:50 pm

Thanks Kerry, never thought of doing that, will be doing the exact same this weekend...just need to find a post on repairing soldering irons :lol:
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WaikatoYakka
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Thu Aug 08, 2013 9:10 pm

Hairy Little Dwarf wrote:What I want to know is what are you guys doing to your SLAs to keep losing terminals???
You obviously havent been a passenger in my car yet HLD :lol:
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Kerry
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Thu Aug 08, 2013 10:13 pm

Hairy Little Dwarf wrote:What I want to know is what are you guys doing to your SLAs to keep losing terminals???
I was too lazy to build a battery box in the hull so mine just sits loose in the front well - that's why it get's a little wet - plus the inside of my hull sees a fair bit of water usually so mounting it in there prob wouldn't solve the problem. :lol:
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awondering
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Fri Aug 09, 2013 7:50 am

I always give mine a squirt with the hose after each trip :sweat: and spray with Lanocote and to date no issues :?: (perhaps I shouldn't have said that)

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Limitless
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Fri Aug 09, 2013 8:40 am

awondering wrote:I always give mine a squirt with the hose after each trip :sweat: and spray with Lanocote and to date no issues :?: (perhaps I shouldn't have said that)
I've a similar wash/dry/apply anti-corrosion system to AW. If salt contamination from the battery and connections isn't removed corrosion and electrolysis can occur wherever dissimilar metals touch, or within alloyed metals (like those used in some types of terminals and connectors). This can make the affected metals very brittle and easy to break.

Washing and drying removes the salt contamination and minimised any electrolysis. It's not uncommon to see a tiny build up of salt right at the point where the battery terminal emerges from the embedding compound on the top of the battery, especially if it's been stressed a little creating a tiny surface crack between the terminal and epoxy. Since this is a mechanical stress area as cables are plugged on and off, this is inevitably where breakage occurs.
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MikeAqua
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Fri Aug 09, 2013 9:10 am

You could replace the crimp on terminal with a soldered on brass plated one. Smear on a bit of petroleum jelly and then cover in heat shrink. My boat was rewired this way 9 years ago by a auto-elctrician mate and still no signs of deterioration, even in the bilge.

Or skip the vaseline and use liquid electrical tape.

(some good advice on here soemwhere from limitless abotuy corect soldering technique).
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