The Intact Battery-Guard is a compact, Bluetooth 4.0 enabled battery monitoring device designed for 12V and 24V lead-acid (wet, gel, AGM, EFB) and LiFePO4 batteries. It continuously tracks battery voltage within a 6V to 32V range, sending push notifications to a smartphone app (Android/Apple) if the voltage drops below a critical level. With a low current consumption of approximately 2 mA and reverse polarity protection, it connects directly to battery terminals via ring eyelets. The device stores data for up to 31 days and allows monitoring of up to five Battery-Guards from a single smartphone. Its robust design is IP65 rated and operates in temperatures from -20°C to +70°C.