Batteries generate explosive gases, contain corrosive acid and produce levels of electric current sufficient to cause serious injury. While charging always heed the following precautions:
Before charging, disconnect and remove the battery from the vehicle - charging the battery with the cables connected may damage the vehicle's electrical system.
Make sure the battery charger leads are securely clamped to the battery terminals BEFORE switching on the battery charger. Do not move the leads once the charger is switched on.
While charging, shield your eyes or avoid leaning over the battery and keep the area around the top of the battery well ventilated.
Do not allow open flame and/or incandescent lamps near the battery (batteries generate inflammable hydrogen during and after charging).
If the battery is fitted with a condition indicator, the indicator shows GREEN when the battery is charged sufficiently. When charging is finished, switch off the battery charger BEFORE disconnecting the leads from the battery terminals.
After charging, leave the battery for an hour BEFORE reconnection to the vehicle - this will allow time for explosive gases to disperse, thereby minimising the risk of fire or explosion.
NOTE: Be aware that a battery will take longer to charge in a cold environment.
CAUTION: DO NOT charge the battery if it is connected to the vehicle - this may seriously damage the electrical system.
DO NOT attempt to charge the battery if the battery condition indicator is clear or light yellow.
DO NOT charge the battery if it is suspected of being frozen.