CHINESE ACTIVE BALANCING DEVICES

HI, ANYBODY knows about the chineese active balancing devices, are they as efficients like they claim ?

Each is different.

Link to the unit you are asking about.

And define what you mean by "efficiency"?

I use the qnbbm balancers on my 4s lifepo4 220ah battery. That battery had balancing issues, the balancers have been connected to the battery 24/7 for the past 2 years and have kept the battery in perfect balance. I paid about 100 dollars for them and it was a good investment form me.
I tried some of the smaller 20 dollar active balancers and they were practically useless. I tested on a severely out of balance batterypack and left them overnight and in the morning the pack was almost in the same condition.