Volkswagen Golf GTI 2016, Owner'S Manual

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A battery that is frozen or was frozen, but has since thawed,
must be replaced.
When the vehicle battery is jump-started, it gives off hydrogen
gas, which is highly explosive! Always keep fire, sparks, open
flame, and smoking materials far away from vehicle batteries.
Never use a mobile telephone while connecting or
disconnecting jumper cables.
Jump-start batteries only in well-ventilated areas. Batteries
give off highly explosive hydrogen gas during jump-starting.
Always route the jumper cables so that they cannot get caught
in any moving parts in the engine compartment.
Never short out the battery terminals by connecting the
positive (+) and negative (-) terminals with each other.
Never connect the negative cable from the other vehicle
directly to the negative terminal of the dead battery, as this
may cause the hydrogen gas given off by the dead battery to
explode.
Never attach the negative cable from the vehicle providing
starting assistance to any part of the fuel system or to the
brake hoses or brake lines.
Never allow the non-insulated parts of the battery clamps to
touch.
Never allow the jumper cable attached to the positive battery
terminal to contact metal parts of the vehicle.