Battery Tender Digital Voltage Meter The Battery Tender Voltage Indicator efficiently tests battery voltage to ascertain the charge level. It employs LED indicator lights, making it straightforward to identify the battery's status: Green signifies charged, Yellow indicates low charge, and Red denotes discharged. Features: Designed for use on 12v Flooded, AGM and Gel batteries Display voltage range is 3v to 16v Quick battery status reading with the green, yellow and red lights Note: Requires Battery Tender SAE Quick Disconnect Harness (sold separately). Digital read out works with a lithium battery but colored light function does not.