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Old 07-06-2008, 10:26 PM   #1 (permalink)
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How to Repair an Optima Yellow Top

Recently, I had a problem with one of the Optima batteries on my electric motorcycle.

I shorted out a post and melted it.


Today, I finally had some time to work on the cycle. I cleaned up some of the wiring and decided to fix the post too.

The first thing I did was cut the post off, as it really wasn't needed, because Yellow Tops have side posts as well, which is what I was using.

Of course the instant I cut the post off, the cycle no longer worked. Turns out that Optimas actually connect the cells internally through the POST!

So even though I cut the top post off, now the side posts no longer worked!

I called the battery store, where the guy informed me about the internal connection through the post. He also said there was no way to fix it, I just wrecked it, and by the way, I just lost my warranty too!

After getting off the phone, I got into an angry "I'll show him" mood.

I drilled a hole through both what was left of post and the bit I cut off.


I then tapped both parts.


I threaded a bolt through both parts and tightened it down.


Then I hit it with a torch to melt the lead back together, bit it was not narrow enough of a flame, so I finished off melting the lead seam together with a soldering iron.




Turned the cycle on - worked great again.

So there you go. Fix a $160 battery with a 10 cent bolt.

Take that! dude at the battery store!






(Please note that anytime you work with lead, don't breath any fumes, and wash your hands well after working. When working with batteries, always know where any conductive tools are and what's positive and negative!!!)


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Old 07-07-2008, 12:17 AM   #2 (permalink)
Red
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Nice fix. Why bother sticking the old post back in? I'd have just used the bolt with a nut
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Old 07-07-2008, 12:58 AM   #3 (permalink)
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I think it took a lot of balls to fix a battery. Dont know if that is a gel-cell or not but putting a torch to a conventional battery should be on the not to do list. Lethal level current, acid and explosive gasses all make batteries pretty dangerous IMO.
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Old 07-07-2008, 01:32 AM   #4 (permalink)
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Duffman -

Quote:
Originally Posted by Duffman View Post
I think it took a lot of balls to fix a battery. Dont know if that is a gel-cell or not but putting a torch to a conventional battery should be on the not to do list. Lethal level current, acid and explosive gasses all make batteries pretty dangerous IMO.
Would the "cold heat" option have worked for melting the solder or is that even more dangerous ?!?!?!?!?

bennelson -

Great fix!

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Old 07-07-2008, 01:51 AM   #5 (permalink)
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Maybe the OP has the background and knows what he is doing but IMO fixing a battery is not a DIY repair and should not be represented to be one. I am not sure you are aware or not but batteries can explode, any of the the mechanics on this site probably know of someone that is has happened to.
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Old 07-07-2008, 02:10 AM   #6 (permalink)
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Whatever Duff. Good job Ben!! Do keep the torch (and possible sparks) away next time though

Last edited by dcb; 07-07-2008 at 02:16 AM.
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Old 07-07-2008, 06:52 AM   #7 (permalink)
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Could have got a battery terminal of a scrapper & used that to replace the burned one... would have looked better. Good job though. This is what i did to convert my race battery with 6mm threads to a post type.
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Old 07-07-2008, 08:40 PM   #8 (permalink)
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You can buy a standard post battery converter terminal (marine to standard post). Instead of using a bolt, use some ready-rod (all-thread to you Western Washington types) and screw on the new terminal. Of course your method is cheaper.
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Old 07-07-2008, 08:45 PM   #9 (permalink)
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If I recall correctly, I was the one who said to just cut the bad post off assuming this battery was similar to all automotive/marine type batteries.

Good save!
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