TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: (7,9) comprise metal foils. (1) further comprises at least one electrical lead attached to one (7,9) (preferably two leads, first attached to one electrode and the second to the other electrode). The device has a switching temperature (Ts) of at most 85degreesC.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Conductive Filler: The filler comprises carbon black. The carbon has an n-dibutyl phthalate (DBP) number of 60 - 120 cm3/100 g.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymeric Component: The component comprises less than 20 wt.% of the vinyl acetate. Tm is at least 70degreesC.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Battery: The battery is rechargeable and is a nickel-cadmium battery, a nickel-metal hydride battery, a lithium ion battery or a lithium-polymer battery. The battery is an Aa, an AAA or a prismatic cell battery. Preferred Assembly: The assembly comprises first and second batteries and (1) contacts the two batteries. (1) contacts a button terminal on the first battery. The assembly is suitable for use at voltage of at most 16 VDC. EXAMPLE - Ultrathene UE637 (ethylene/vinyl acetate copolymer having 9 wt.% of the comonomer) (60 vol.%) and Raven 430 Ultra (carbon black having particle size of about 82 nm, a structure (n-dibutyl phthalate (DBP)) number) of 80 cm3/100 g and a surface area of 34 m2/g (CB)) (40 vol.%) were preblended and mixed. The mixture was palletized and then extruded into a sheet having a thickness of 0.127 mm. The sheet was laminated with two layers of electrodeposited nickel-copper foil (Type 31, having 0.033 mm thickness). The laminate produced was solder-coated and positive temperature coefficient (PTC) elements with dimensions of 5x12x0.127 mm were cut from the laminate. The PTC elements were heated at 165degreesC for 30 seconds, 5 - 10 seconds of which were at 185degreesC. The elements were then irradiated to 10 Mrads using a Co60 approximately irradiation source. Nickel metal leads with dimensions of 4x17x0.13 mm were attached to opposite sides of the elements by reflowing the solder. The leads were attached such that a tab of 5 mm extended from the edge of the element. Each device was temperature cycled six cycles from -40 - 85degreesC with a dwell time of 30 minutes. This was compared with devices made from Enathene 705-009 (ethylene/butyl acrylate copolymer having 5 wt.% of the comonomer) (58 vol.%) and CB (42 vol.%). The test/comparative device showed the following properties: initial resistance (ohm) = 0.023/0.015; melting temperature (degreesC) = 96/105; melt index (g/10 min) = 3.2/3; switching temperature (degreesC) = 80/93 and PTC anomaly = 4.6/4.6. The test device showed both high PTC anomaly and low switching temperature.