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NEED HELP TO KNOW WHAT THIS WIRE FUNCTION IS?

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Hi the community, 

image.png.0300b54278281dd038469447816d711a.png

This is the BMS from an old S300 (16s lifepo4 cells). Cells are dead and I want to replace this battery by a new li-ion battery (14s with it's own BMS). But the S300 will not start as this wire (at SIN place on original BMS) is not link to the motherboard with the new battery. Does somebody know what the function of this wire is? How can I link it on a generic BMS, if it's possible? Many thanks in advance.

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What does it say?  Just from working on boards in general

GIN is ground in

VIN is positive voltage in

Edited by RockyTop

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