Storage battery state-of-charge indicator
Storage battery terminal structure with indicator means
Storage battery with indicating device
Sulfuric acid concentration sensor and lead acid battery equippe
System and method for monitoring battery aging
Temperature responsive battery tester
Temperature responsive battery tester
Thermochromic battery tester
Thermostat and battery pack containing the thermostat
Universal camcorder battery pack
Universal electrolyte level indicator for wet cell batteries
Universal inexpensive battery state-of-charge indicator
Vacuum battery indicator
Variable precision multivoltage step battery
Warning device for indicating critical condition of starter batt