. SAFETY PRECAUTIONS FOR OPERATION 2 - 22 PRECAUTIONS IN COLD AREAS Carry out the warming-up operation thoroughly. I f the machine is not thoroughly warmed up before the control levers are operated , the reaction of the machine will be slow, and thi s may lead to unexpected accidents. If the battery electrolyte is frozen , d o n ot charge or he engine with a different powe There is a hazard t hat this will ignite th e battery. Befor e charging or starting the engine with a different power source, melt the battery electrolyte and check for frost a nd leakage o f batter y electrolyte before starting