CTEK CTX Battery Sense makes it possible to show you the state of charge of all your 12v batteries in real time. Battery Sense provides valuable knowledge about your batteries in a simple, user-friendly and transparent way. Knowledge of your batteries’charge level makes it easy to monitor their health status and thus maximize your 12v battery performance and service life. The knowledge that will allow you to avoid costly battery replacements and annoying vehicle breakdowns. 12v Battery knowledge presented directly in your pocket. Connect BATTERY SENSE to the battery and download the app. Your batteries will now start talking to you via your smartphone. With Battery Sense connected you don't have to worry about when to charge. Just walk to your car or vehicle and Battery Sense will talk to you via Bluetooth – you don't even have to start the engine. Battery Sense will show you all your batteries the State of Charge. 12v Battery Sense will warn you when you have to charge, well in advance.