Keep batteries away from children. Batteries are not toys. A child could be burnt or blinded while playing around a battery. Charged batteries can give off heat and harmful gases. Ventilation is necessary in the battery area.
Vented batteries emit explosive gases when being charged.
Ventilate the charging area. Never smoke or have open flames in a non-ventilated battery area. Explosive gases can be set off by a match, incorrect connection of battery cables, and careless use of tools around the battery. Use proper lifting techniques when moving batteries. Batteries are small, but heavy and awkward to lift.