Lead-acid Battery Sag---Log

Sooooooooo.... I did a little log this evening on the bike. Just wanted to see how bad the battery sag actually is. Here you go:

Click on picture to see it all, its too wide.

Brown=Volts
Green=kmh/speed
Purple=Amps

The graph is so jumpy because I go on fast down a straight, up the hill, turn on the hill, down the hill and so on.

Looks like when I accelerate the batteries sag 20 volts.

Jake