If you’ve ever been caught a situation where your car battery has died on you in an inopportune moment, then perhaps it is time to purchase the INNOVA 3721 Battery and Charging System Monitor. This device plugs into your vehicle’s cigarette lighter of 12-volt negative ground systems’ cars and will report the battery’s voltage on the LCD screen. It also provides a simple bar graph to indicate the battery level as well as red, yellow, and green indicator lights for quick identification about your battery’s status. If this piques your interest, you may purchase the INNOVA 3721 Battery and Charging System Monitor from Amazon for $11.88. This seems like a handy device to keep in your glove compartment to check on your car battery’s status periodically to prevent those “Surprise! Dead battery!” moments.