No, it is sometimes different depending on the battery manufacturer. The POSITIVE (POS, P, +) battery post usually has a larger diameter than the NEGATIVE (NEG, N, -) post.
As explained by Pep Boys, two things are needed to charge a battery. A voltage source strong enough to move current through a battery, and time. The more current we can push into a battery, the faster we can charge it. Charging at too high rate however can overheat and damage the battery. To reduce the chances of this happening, charge at a slow rate.
The rate/time a battery recharges also depends on a couple of factors, how discharged is the battery and if the battery is cold. Check the battery temperature during charging. If the battery is hot to the touch, stop charging immediately until the battery cools.
Follow Pep Boys steps on how to charge your car battery.
Test Engineer John Banta provides car battery tips learned from years of testing, shared via Consumer Reports.