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Old May 02, 2012, 04:58 PM
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Help!
12 Volt Starter Conversion Help?

I have a Hobbico 12v electric starter, 3 Shark 1500 mAh 6s 7.2 NiCd batteries, and a male connector. I would like to solder a series-circuit connection on the batteries. How do I do this?(I know the voltage is overkill, I want lots of power.) Thanks!
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Old May 02, 2012, 05:47 PM
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Originally Posted by trevorcgross View Post
I have a Hobbico 12v electric starter, 3 Shark 1500 mAh 6s 7.2 NiCd batteries, and a male connector. I would like to solder a series-circuit connection on the batteries. How do I do this?(I know the voltage is overkill, I want lots of power.) Thanks!
Get matching connectors and solder up a series harness. But I think you're going to toast the brushes on that starter. You'll be sending a 12 volt starter over 5 times its rated voltage. It won't run long that way. I'd expect a few minutes out of it... a few seconds if you put a load on it, like try to start a big engine with it.

And, what's the C rating of those batteries? Dumping over 60 volts into a starter wound for 12 volt operation is going to run some serious amps into it. Those batteries may get damaged too. More I think of it, the more this looks like a bad idea.

EDIT: Oh, 6S NiCd... well, even 22 volts it too much for longevity.
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Old May 02, 2012, 05:56 PM
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what if I just did 2 batteries? How would I solder them? By the way, it's for a .61 2 stroke.
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Old May 02, 2012, 08:09 PM
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It would be fine on the 21.6 volts of the three packs, but will do the job on two packs wired in series. Connect the positive of one pack to the starter. Connect the negative of the other pack to the other wire of the starter. Connect the two remaining wires on the packs to each other.

Mark
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Old May 02, 2012, 09:03 PM
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Yes, that's what I thought, how do I solder them? Tinning? What solder? Silver ribbon?
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Old May 03, 2012, 12:29 AM
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what if I just did 2 batteries? How would I solder them? By the way, it's for a .61 2 stroke.
Just so you know, that starter has no trouble turning over a .61 on 12volts. I used one for years.
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Old May 03, 2012, 12:34 AM
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Yes, that's what I thought, how do I solder them? Tinning? What solder? Silver ribbon?
I don't have the best technique, so others can chime in better, I'm sure. But I need more than a pencil iron. I use a Weller soldering gun to get enough heat. You're dealing with solder cups on the ends of the connectors. You put the bare wire in the cup and heat it all enough to fill the cup with solder. Tinning... I don't bother, though I do tin the iron itself to keep it from corroding. Whatever you do, make sure the solder gets hot enough to flow into the wire.

You don't need to silver solder.
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Old May 03, 2012, 01:22 AM View Post
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Old May 03, 2012, 05:35 AM
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Ok. I will tin 2 batteries with lead solder. Proper technique? Tips? Tricks?
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Old May 04, 2012, 07:56 PM
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How to solder bullet connectors for Brushless Motors/ ESC (8 min 15 sec)
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Old May 06, 2012, 06:09 PM
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Go to the Home Depot electrical dept and buy a small package of butt crimp splice connectors of a suitable size. They're good for about 30A.
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Old May 06, 2012, 08:31 PM
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Thank-you! that's what I need. I'll put heat shrink tubing over the wires before I solder them.
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