Changing battery... which terminal first?

[Scarletpimpofnel]

On line a web site said when changing a car battery to disconnect the positive first and reconnect it last. But the battery instructions say disconnect the negative first and reconnect it last.

Which is right and why?

[bunchofkeys]

Disconnect the negative first.

When connecting connect the positive first.

[GreenV8S]

When connecting jump leads between cars, you connect the ground last and disconnect it first. This reduces the risk that either end of the positive jump lead can short out against grounded metal on either car.

When installing a battery it probably doesn't matter which terminal you connect first in most cases, but if you connect the ground last it slightly reduces the chance that you short a spanner between the battery terminal and nearby grounded metal.

[donkmeister]

GreenV8S said:

When connecting jump leads between cars, you connect the ground last and disconnect it first. This reduces the risk that either end of the positive jump lead can short out against grounded metal on either car.

When installing a battery it probably doesn't matter which terminal you connect first in most cases, but if you connect the ground last it slightly reduces the chance that you short a spanner between the battery terminal and nearby grounded metal.

This was my understanding, and "am I possibly going to weld this tool to my inner wing?" is a handy way to remember the correct order.