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The essential function of a battery monitor is to calculate ampere-hours used and the battery's state of charge. The ampere-hours consumed are calculated by integrating the current flowing into or out of the battery. Battery monitors from Victron Energy with "Smart" have Bluetooth support which makes your phone act as a display by connecting to the VictronConnect app on your phone (or tablet). With the app, you can conveniently read all monitored battery parameters, such as charge status, remaining time, historical information and much more.