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Victron Smart battery monitor BMV712.
The Victron BM712 is a smart battery gauge designed to monitor your battery providing a wide range of statistics and information about your battery.
The device features built in Bluetooth so you are able to monitor your battery from your smartphone or tablet.
The gauge draws very little current from your battery, its as little as 0.7Ah per month on a 12V system or 0.6Ah per month on a 24V system. Also features a bi-stable alarm relay which prevents an increase in current draw in case of an alarm.