7.3.1 Batteries ......................................................................................................................................................................................... 42 7.3.2 Tanks .............................................................................................................................................................................................. 43 7.3.3 Temperature sensors ..................................................................................................................................................................... 44 7.3.4 Current sensors .............................................................................................................................................................................. 45 7.3.5 Voltmeters ...................................................................................................................................................................................... 45 7.3.6 Ohmmeters ..................................................................................................................................................................................... 46 7.3.7 Coulomb counter ........................................................................................................................................................................... 46