E46 323I Electrical Issue

New Year Gents

Need some advice\input



My battery light stays on, then off......then after a while comes on again

Last week while driving home after playing music for a while(standard sound), my ABS,ASC lights came on, while the battery light stayed on..then after a while an Info warning light came on(where you see the Gear you are in) Auto Car...

Then the car would not start...after switching it off

Charged my battery took it to an Auto Elec(he saw nothing wrong), car was fine no lights...then yesterday it came on again

When I did the voltage test, when off its 12.2..when idling its on 14.1

What could be the problem(Battery is a month old)

Thanks