THE INJURED WAS INSTALLING NEW CELLS IN SET OF BATTERIES IN RAIL RUNNER, THE BATTERIES HAD BEEN ON CHRG AND WAS OVER CHARGE AND THE BATTERIES GAVE OFF A LARGE AMOUNT OF FUMES WHICH THE INJURED INHALED. THE NEXT DAY INJURED HAD CHEST PAIN. SUSPECTED HEART ATTACK. 5-31-02 DR STATED MYOCARIDITIS.