TECMATE Cord with Tester Lithium Jar/20 O-127JAR

2 automatic modes battery charge level monitor (single LED blink mode) charging system test (arrow mode), 3 LEDs display full to empty voltage range for 12.8V/13.2V Lithium batteries (LFP/LiFePO4/Lithium nano Phosphate); 4th LED warns when vehicle system or connected battery charger is OVERCHARGING, Battery charge level : LED matching charge level blinks every 10 seconds (long term draw less than 0.2mA), Vehicle Charge system : LED arrow mode activates when charge voltage reaches effective lithium charge range of 14.2V 14.5V (v green LED). OVERCHARGE warning activates at 14.6V+, SAE charge port, 5A fuse, 1/4? / M6 ringlets