Anyone have the "flying capacitor" active balancers fail and kill cells?

[Alkaline]

Has anyone had an issue where the flying capacitor style active balancers have failed and then decided to just keep draining cells? I have heard of these failing and stop working but not that if they fail they end up deciding to go berserk and start draining cells, also did you have a situation where it drained 1 cell and then overcharged another one?

I'm reffering to the balancers that heltec sells, the black one with the red/silver caps.

 

[Ellcon123]

Personally I don't see the mechanism for this. Balancing goes from high to low voltage as that's how energy flows. Simple balancing wastes energy by heat through a resistor. Heltec style uses capacitors to move energy from cell to cell but it still goes from high to low voltage.

 

[Alkaline]

Well thats what I thought but now I'm hearing when the active cell balancer dies it turns into a vampire and sucks the power away?