It also opens up for charging with a CTEK 12 volt charger. - LED Display - Adjustable maximum voltage level - Adjustable minimum voltage level - 3 Adjustable alarms typically 50 30 20 - Alarms to be non-irritating and have a mute function -. Battery Level Indicator Circuit Using Lm3914 Electronic Circuit Projects Circuit Diagram Electronic Schematics FIXITOK Battery Meter with Alarm Capacity Voltage Monitor DC 12V 24V 36V 48V 60V 72V 84V Battery Capacity Voltage Gauge Indicator for Golf Cart Boat Car RV Motorcycle Lithium Battery Green 43 out of 5 stars. . All batteries new read about 128 volts these cars will show problems at 123 or under. An INDICATOR is the easiest way to monitor the charge in your battery. DM670TM Battery Powered Temperature Indicator. A green dot means the battery is 75 or more charged and is okay for use or further testing. These sealed-top batteries have a built-in hydrometer to indicate charge. The