Changing battery connectors

1

My QS8 connectors are welded together for the 2nd time. I changed them out a couple years ago because they did this and they were discolored inside.

I know they were clean inside this time and the resistor was good, because I helped a friend buy a used SP140 the same day and was showing him the issues with the discolored connector on it and that the one he bought had a blown resistor.

Are the QS8 connectors my only option on the original battery? I’d like to change to the Anderson connectors but it doesn’t seem like it has the anti-spark option.

Thanks,

  • Marc
2

So, is the QS8 connector the only option for a battery without a soft start switch?

Thanks,

  • Marc
3

You could wire it with both connectors. Plug in the QS8 first, then the Anderson. You could leave the QS8 plugged in because more current will flow through the better connection if the QS8 starts to get buildup. As the connection gets dirty or worn then even less current will flow through it and more will go through the Anderson.

Actually, the other connection doesn’t have to be an Anderson… it could be another QS8. In this case both connectors will see half the amps.

Are you connecting the QS8 slowly? It’s best to connect just the tip, pause, then fully seat.

4

I’m reading about this QS8 problem for some time on this forum and I just don’t get it. How can these connectors be welded together other than by spark, which could occur either by not slowly connecting them or by a bad resistor?
What kind of amps are people using in flight?
I’m using like 50-70A which should be a joke for the QS8 that are meant for like 120-180A, which they must be because they are huge beside the XT90 that are for 90A.
And even if used at 150A (can’t find a reason why) they could get to what…150C? Nowhere near the melting point of anny metal. So how does it happend?

5

Frustrating, but you’re on it! XT90-S could solve this cleanly.

6

When the connection gets damaged and contaminated from arcing it can’t handle the rated amperage. This causes it to get hot and the plastic melts just enough to ooze into the connection making it almost impossible to get apart. I think it’s the ring of plastic that separates the resistor connection from the main connection that melts or deforms just enough to lock it together.

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