Yes you can, that is why its there.
I'm new to Allantes, recently bought my '93(Polo/Beige, 9500mi)which was running/driving fine. Went out this morning to start it(OAT 33dF), battery seems fine, but no crank. So, first step is to make sure battery is OK by charging it. Can I charge it by just putting the charger cables on the under hood Battery Positive Termminal (see picture) and a good ground? Much easier than getting into the battery, installing adapters, etc.