2008 Mazda RX-8 Owner's Manual - Page 264

In Case of an Emergency Emergency Starting Keep all flames, including cigarettes, and sparks away from open battery cells: Flames and sparks near open battery cells are dangerous. Hydrogen gas, produced during normal battery operation, could ignite and cause the battery to explode. An exploding battery can cause serious burns and injuries. Do not jump-start a frozen battery or one with a low fluid level: Jump-starting a frozen battery or one with a low fluid level is dangerous. It may rupture or explode, causing serious injury. Connect the negative cable to a good ground point away from the battery: Connecting the end of the second jumper cable to the negative ( ) terminal of the discharged battery is dangerous. A spark could cause the gas around the battery to explode and injure someone. Route the jumper cables away from parts that will be moving: Connecting a jumper cable near or to moving parts (cooling fans, belts) is dangerous. The cable could get caught when the engine starts and cause serious injury. CAUTION Use only a 12 V booster system. You can damage a 12 V starter, ignition system, and other electrical parts beyond repair with a 24 V power supply (two 12 V batteries in series or a 24 V motor generator set). 1. Remove the engine cover. 2. Remove the rubber hose from the battery cover. 7-20