Amazon.com: Runleader 12/24V Battery State of Charge Meter Gauge, Lead Acid Battery Indicator, Battery Tester; Battery Discharge Alert, Use for Golf Cart,Fork Lifts,Star Car, Yamaha(BI001-12/24V) : Automotive
Battery Status Indicator
12V and 24V LED battery indicators - MyLithiumBattery
24V Battery Level Indicator
24V/12V Battery Voltage Level Indicator | Full DIY Project
Easy 12 volt battery level indicator circuit diagram