And...............
If I may add, German engineering takes seriously current draw at rest which is a battery killer via cycling.
The Japanese, especially Nissan, Mazda, and Subaru were notorious for .020-.050 quiescent current. un-curable because the bleed down was feeding ECU and computer PROM. Early Hyundai was another loser. Italian ultra cars needed battery float maintenance.
One of the most prolific violators I find down here are aftermarket boom-boom car stereo amplifiers. Designed by take-another-hit-Murf and turn up the vay-yoom. As much as half an amp suckdown at rest.
Checking at-rest voltage drawdown is good juju. For chassis batteries. My toad has .0013 ampere which is as good as it's going to get.
That AGM Deka compared to a Varta is like Comparing a Rolex Oyster to a Hwang Zhang piece of time from Hong Kong.