battery to provide electrical power at 300 to 600 volts this high voltage is typically achieved by externally connecting multiple lower voltage battery modules electrically in series this is in part due to safety considerations in assembling and operating a series connected u201c stack u201d of typical u201c pouch u201d cells within a battery module since at higher voltages and especially above approximately 60 volts there is a significant risk of electrical arcing and a severe shock hazard since the edge peripheries of u201c flat u201d cells such as typical u201c pouch u201d cells have their cell terminals exposed for safety these cell terminals are connected electrically in series within a low voltage battery module for example having less than 60 volts an object of the present invention is to provide sufficient pressure to ensure that battery modules retain good electrical contact another alternate or additional object is to provide and or use information on the pressure within the modular battery the present invention may be used with the modular battery disclosed in incorporated by reference u s patent publication no 2009 0239130 a1 fig1 shows six cell modules 23 stacked one on another electrically in series and separated by the compressible interconnectors 24 which serve to electrically connect in series one cell module to the next cell module details of the cell modules are found in u s patent publication no 2009 0239130 a1 although it is noted that other modules may be used in accordance with the present invention several interconnectors 24 can be present between two cell modules for example 8 layers each 10 mils in thickness thus.