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Melting battery connectors

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Melting battery connectors

Old 01-04-2021, 08:00 PM
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Default Melting battery connectors

Need some help.
I just bought a proboat Sonicwake 36 from the for sale forums. I took it out for the first run 2 weeks ago and after 2 minutes it stopped. I brought it in and the battery connectors melted and came unsoldered. I figured since it was a used boat, maybe the connectors were worn-out and getting a bad connection. I soldered on brand new connectors and took it out this past weekend. It ran for a few minutes and stopped. Same thing. The motor was also scorching hot even though I can see the water coming out of the cooling tube while it runs.
I'm not really sure whats going on. I think I may have a bad motor? But why would my battery connectors melt and the motor is hot but the esc seems normal? Any suggestions?
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Old 01-04-2021, 09:20 PM
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Take it apart and see where the binding is. Something in the shaft might be corroded and bound up. The prop shaft should spin pretty free when the motor is disconnected. Pull the motor and check the bushings/bearings if you can. Also, check the water system if it has water cooling. Is it getting water through it.
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Old 01-05-2021, 06:30 AM
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Id also check the shaft along with the prop whats its pitch and diameter?. easy for a person to over size the prop . that will cause issues like yours?
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Old 01-10-2021, 06:11 AM
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What connectors are you using now? What size batery c rating? Boats have a high current draw and short run time, When I was is electric boating I was running bullet connectors.
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Old 02-22-2021, 07:55 PM
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What batteries are you using?
What Connectors are you using?
What prop is on the boat?
Do you have the programing box or card for the esc?
Have you checked for binding in the cable and is there a gap at the strut between the strut and the drive dog?
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Old 03-01-2021, 12:41 PM
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ditch the blue ec5 connectors and put some xt90s on there. You shouldnt have any more issues.
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Old 03-01-2021, 10:50 PM
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Originally Posted by jefferz
ditch the blue ec5 connectors and put some xt90s on there. You shouldnt have any more issues.
ec5 is rated for now current than xt90 and has larger pins.
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Old 03-02-2021, 12:35 AM
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It's a good thing ratings are never exaggerated to increase sales.
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Old 03-02-2021, 01:24 AM
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Originally Posted by fyrstormer
It's a good thing ratings are never exaggerated to increase sales.
it's physically the larger pin. Normally with bullet style connectors the 5mm pin is gonna handle more current than 4.5mm.

It's much easier to cause cold solder joint in ec5 if you don't have higher wattage iron when assembling. That's the issue many owners have with ec5. I don't think it's cold solder joint in this case though, it motor is scorching hot.
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Old 03-02-2021, 10:52 PM
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The last time I used EC plugs, they had sheet-metal springs that wrapped around the pins to form a pressure-fit inside the receptacles, whereas the last time I used XT plugs, they had pins made from solid metal rods that were split down the middle to allow the pins to expand and form a pressure-fit. Split-rod pins can handle higher amperage because they have more contacting surface per unit of circumference. Have EC plugs switched to split-rod pins, or are they still using sheet-metal springs?
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Old 03-02-2021, 10:57 PM
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They use split rod pins. Only place i'd use the other ones is in the garbage can. I don't know when they got updated, I've been isn't split bullet type for maybe 5 years. When icharger 4010duo was new the ec5 with better connectors where what most places sold.

That was like 2013 or 2014, so it's been more than 5 years
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