VW Passat 2,0 TDi 06 bad cold start 19-

Hello! Tandempumpe ok,glow plugs ok,dynamo,ok,glow relay ok. starter ok.
Solution? bad battery or too weak batteri.
You can see it on dash the lighting dimmer so here easy solution. It glows enough and it is possible to start a little and glow a little several times as well this is a video to show bad start looks like etc.
Here little over 200 miles and here starts batteri are too bad for the winter Vw have orginal AGM so best powerful batteri AGM;)