Why does overkill solder leads onto the center position between the 3 power leads on the 4S-120A? Can I cut them off?

[Terrapin]

I was looking at my BMS and the printed circuit seems to have no connection to anywhere. It makes me very glad I went with the 8Gauge upgrade but you can even see in this Vid at time stamp 5:27 that Will just ignored the hole through the board between the wires he soldered on. It is surrounded by metal to solder to but it seems like it goes nowhere... I don't want to waste terminals or space and clutter up the build. Does anyone just cut them off? I am considering it. Why are they there at all?

 

[Freep]

What vid?

 

[Terrapin]

What vid?

TY edited...

 

[Terrapin]

What vid?

I added a picture of each side of the board...?

 

[Gazoo]

I suggest using your multimeter to confirm that. Put it on the ohms setting and measure between the wire in question and either one of the other wires. If you see 0 ohms then it is a muti layer printed circuit board.

 

[Terrapin]

I suggest using your multimeter to confirm that. Put it on the ohms setting and measure between the wire in question and either one of the other wires. If you see 0 ohms then it is a muti layer printed circuit board.

Ahhh! see I do need to ask... Thx again.

 

[OnTheRoadAgain]

Is there any reason to buy the Overkill BMS with Threaded connections for the leads vs leads soldered to the board?

I saw Will's video where he reviewed this last week and he has the one that has the bolts for adding your own cables.

 

[Supervstech]

Is there any reason to buy the Overkill BMS with Threaded connections for the leads vs leads soldered to the board?

I saw Will's video where he reviewed this last week and he has the one that has the bolts for adding your own cables.

I thought that was just for the 12V model

 

[OnTheRoadAgain]

I thought that was just for the 12V model

Isn't this thread about a 4S unit ?
I'm not the expert here....but I thought 4S = 12v ??

 

[Theo74]

Could be that the BMS pcb is multi layer, and the middle solder point has a inner layer connection.

 

[Terrapin]

I suggest using your multimeter to confirm that. Put it on the ohms setting and measure between the wire in question and either one of the other wires. If you see 0 ohms then it is a muti layer printed circuit board.

The middle lead is 100% live. Thanks all.

 

[HRTKD]

The middle lead is 100% live. Thanks all.

Whew! Had me worried there for a moment.

 

[Terrapin]

Whew! Had me worried there for a moment.

I am just old enought ot have done some really basic projects in my youth like building a LED calcualtor... Never seen a board since then and certainly never knew they were sandwiching stuff.... I feel old... LOL

 

[curiouscarbon]

Thank you for addressing the mystery ? even people with relatively less experience can make worthwhile discoveries

 

[Theo74]

I am just old enought ot have done some really basic projects in my youth like building a LED calcualtor... Never seen a board since then and certainly never knew they were sandwiching stuff.... I feel old... LOL

To give you a little update : https://www.theengineeringknowledge.com/multilayer-pcb/

 

[Terrapin]

To give you a little update : https://www.theengineeringknowledge.com/multilayer-pcb/

that was cool... only makes sense given how small and fast things have gotten... I did see that was posted in 2019. Must have been way before that this started being done but still...I feel a little less old if it's that new to others beside me ?

 

[Gazoo]

that was cool... only makes sense given how small and fast things have gotten... I did see that was posted in 2019. Must have been way before that this started being done but still...I feel a little less old if it's that new to others beside me ?

I remember years ago I was fooled by all of this. I don't recall what I was working on as I had a few small electronic projects I was working on. I do remember pointing a flashlight from the other side of the board and then the light bulb in my brain lit up as I saw the inner traces. I don't know why I didn't use my DMM...maybe the battery was dead....lol.

 

[squowse]

I'm interested in the little QA printout they attached to it. Could I have a proper look?

 

[MrNatural22]

The middle lead is 100% live. Thanks all.

I wonder if the 4s model that has a bolted option, is connected into the middle circuit too? ?

 

[Terrapin]

I wonder if the 4s model that has a bolted option, is connected into the middle circuit too? ?

IDK but If I knew then what I know now I would have opted for the Scew terminals myself. The only plus side to the wires for my use is a really close place to attach a fuse after crimping rings on them..