In Plain English=Please describe what the blue,green purple bars mean & do

They provide another means of informing you of battery state-of-charge, rather than having to count the bars.

That simplifies it to a quick glance.

 

Here's a visual...

 

Bars Color StateOfCharge
1 purple 40-44%
2 purple 43-47,5%
3 blue 45-51,5%
4 blue 49-54,5%
5 blue 52-57,5%
6 blue 55-66,5%
7 green 64-77,5%
8 green 75-81%

The threshold differs between charging and discharging. That means after driving electrically and losing a bar it's necessary more than just a braking to get the bar back and vice versa.

The battery ECU of the car strives for around 60% SOC.

SM-G950F ?

 

is one bar legit for a healthy battery?

 

Yes, you will frequently see that in hot weather, stop and go, with the AC compressor running.

 

thanks, i don't remember ever seeing less than two, but it doesn't get that hot here

 

Also mountain climbing... Less so after hybrid battery reconditioning...