WHAT DOES MERCEDES GARAGE TAURANGA MEAN?

Immediately after charging the volts ended up at 13.10 but bit by bit dropped to settle at 12.58volts. I connected the battery, and Here's where the confusion starts off. The 1st time I place The important thing in practically nothing happened, but when I attempted a 2nd time "whalla" it worked. I attempted it five times and labored every time. Do