Keep an eye on your vehicle's Lithium battery status through an OptiMate Integrated Battery Lead Monitor by the use of (4) blinking LED lights. 

Features

• (3) LEDs blink every three seconds to indicate a batteries state-of-charge, a fourth LED is an overcharge warning 
• Automatic 2-mode Operation
  • Storage: Displays battery voltage from empty to full including higher-voltage AGM batteries (12.8-13.2 V) with long term amp draw less than 0.2 mA
  • Engine Running: LED arrow mode activates when the minimum of 14.2-14.5 V charge volts is reached
• Integrated 2-pin SAE quick-connect charging port for an easy charger hook-up with rubber sealing cap
• Compatible with 12 V Lithium (LMiFePO4) batteries
• The 1/4 in. (6 mm) and 5/16 in. (8 mm) ringlets easily adapter to battery terminals in many applications
• 15 Amp fuse for protection integrated
• 18 AWG cable
• Works at -40 degree Fahrenheit