The Advanced External BMS and the Internal Compact 200 Series BMS supports an optional SoC (state-of-charge) gauge, designed to display battery capacity as well as other valuable parameters. Battery state-of-charge is calculated by an internal, high sensitivity hall-effect sensor. SoC data can be observed on the LCD display which can show 2 data fields independently. The meter will be most accurate if the battery is fully charged on a regular (weekly) basis. Partial charging and/or cycling may cause the SoC meter reading to drift over time and become less accurate. The SoC display is not waterproof and is designed to be installed in an area that does not receive direct sunlight, moisture, or debris. 
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