The QSO Battery Active Balancer Upgrade. And how a tiny switch makes a simple task impossible!

One of my complaints about the QSO battery was, that the cells were not top balanced when it was delivered. The BMS turned off charging at around 55V and prevented the internal balancer from doings its job (balance start voltage is set to 3.45V which is 55.2V pack voltage).
In the last video (   • Manual Top Balancing of QSO Pre-Assem...  ), we tried to manually balance the battery using light bulbs and a power supply to either discharge cells with higher voltage or charge cells with lower voltage. That works but is a daunting and repetitive job!
So, here comes the first upgrade of the QSO battery and we will install an active balancer which will perfectly and automatically top balance all 16 cells. We're also going to install a manual switch to turn this balancer on if needed. As we know from many tests we have done with these balancers, it should not let it run all the time because it will create an imbalance if the battery is not on a higher voltage and almost fully charged.
I almost gave up on installing this switch and I had to overcome some problems with the little, tiny switch...
I also need someone's help who has a 3D printer. More about this at the end of the video.

QSO pre-assempled LiFePO4 Battery, 51.2V/230Ah/11.7kWh, 200A BMS
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Adjustable Power Supply 60V/5A or 20A:
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4s - 21s Active Balancer:
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