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Good advice. Just want to ask who teach you to connect (-)neg to car body? Apek bawah pokok? Car paint these days already block the connection, also longer route to the battery. I wud suggest direct connection to the battery like in pix, ask the keta hidup to rev car engine first before you attempt dead battery start. Have been helping ppl a lot to jumps start car, even pregnant women who know how to isi minyak and drive saja..Pity nowadays many also dunno how to jumpstart a battery.
*Unker missed the days where you could put car in neutral and jumpstart car in 2nd gear. Maybe CTR or Megane?

Nah, if not done b4, let someone who has done it before do it that's why noobs try and fry cars. Just dun touch the car body with other hand when doing it also. Now batteries mana ada hydrogen gas? All acid free, maintenance free..
Learnt something new, coz have a merc too but touch wood have not had dead batt yet these 3 years compared to jibai H car, every 2 years, on the dot, dieded.