The present invention provides a coating composition for a negative electrode-active material layer, which comprises an active material for a negative electrode, and two or more rubber base binders selected from rubber base binders having a glass transition temperature of 0 to 120 C. The micro-batteries are immersed in the fluid media. A pneumatic automatic shut off control system monitors variables in and around the enclosure, alerts personnel to the existence of potentially unsafe conditions within the enclosure and automatically terminates welding andor other hot-work when an unsafe condition is detected.