The Off Grid Lithium battery monitor/coulometer  is a high-precision device designed to measure battery capacity and performance. It continuously tracks voltage, current, energy consumption, and remaining battery capacity. This allows for more efficient use of the battery system. It is compatible with a wide range of battery types, including Lithium-ion, Lithium Iron Phosphate, Lead Acid, and Nickel-metal Hydride batteries, and can handle working voltages of 8V to 80V. The monitor can handle large continuous current flows up to 100A, and up to 150A for 10 seconds. It is easy to install and can be used in a variety of settings, including mobile and portable powerpacks, cars, boats, recreational vehicles, off-road vehicles, and e-bikes.