What is the Battery Temperature Sensor?

Central to your vehicle’s operation, the battery offers the power that starts and keeps the vehicle going. It also works to keep the power free of spikes by acting as a electrical filtering device, and offers the minimum electrical power levels required to make sure your vehicle’s electrical devices and systems operate correctly. Batteries are temperature-sensitive and a battery’s optimal working temperature range is 40 to 70 degrees Fahrenheit. Temperature also affects your battery’s charging rate. To compensate for temperature difference during battery charges, vehicle charging circuits include battery temperature sensors. The sensor is found on a battery terminal or the case. The battery sensor’s duty is simple: if it senses a temperature difference, it orders the battery control module, or the computer control system in a vehicle or truck, to change the charging rate. For example, if the sensor dictates the battery is cold, it will want an increased charge rate from the alternator.

Bear in mind:

  • As a rule, battery temperature should be routinely checked.
  • The battery temperature sensor check should include the charging rate (terminal deposits), the cables (fraying or bare spots), and of the linkage point (corrosion or deposits).
  • Proper battery charging may be impossible if high levels of wear are observed.

How it is Done:

  • The battery should be disconnected and removed
  • The defective battery temperature sensor is taken out
  • The new battery temperature sensor is installed and linked
  • The battery is reinstalled and connected
  • The Car is tested for proper operation of the battery temperature sensor


A battery temperature sensor requires a routine maintenance; with regular checks, the battery temperature sensor can last 80,000 to 100,000 miles. If you avoid regular battery temperature sensor maintenance, you risk shortening the life of the sensor itself and your car’s battery. Overcharging will severely shorten a vehicle battery’s life. If you find corrosion or deposits or bare or frayed wire, change the battery temperature sensor as quickly as possible.

What common signs indicate you may have to replace the Battery Temperature Sensor?

  • Irregular charging rates
  • Low battery voltage
  • Corroded or deposits on the battery or sensor connection
  • Broken or bare sensor cabling

How vital is this service?

Proper battery sensor service is vital to the longevity of your battery and its operation. Conventionally, your battery will last you about four years. If you fail to change the battery temperature sensor, you will continue to damage the battery. Continued use of a non-working or damaged battery temperature sensor gives the risk of depleting your vehicle’s battery to the point where it will no longer keeps a charge.