Note: Not FAA Approved. Intended for use in experimental aircraft only.When quality, performance, and safety matter, EarthX is the most trusted andused brand by experimental aircraft manufacturers and experimental aircraftowners, and endorsed by engine companies such as Rotax, Continental, ULS Power and Viking. Remove weight and increase power, all with one product!These ETX Hundred series (ETX680C, ETX680, ETX900 and the ETX1200) batteries are recommended for your primary engine aircraft battery. These models are equipped with redundant electronic circuits on the BMS board and have an LED battery fault light indicator to alert you to cell health and state of charge. The battery management features include over discharge protection, over charge protection, short circuit protection up 1000 amps, excessive cranking protection (temperature sensing) in addition to integrated cell balancing technology.With an EarthX lithium battery, you will gain a significant amount of cranking amps and drop a minimum of 11+ pounds instantly by switching from a lead acid battery.Please view the Aircraft Application Flowchart under the documents tab for assistance in selecting the correct EarthX battery for your application.Additional Specs MODEL TERMINAL POLARITY CHARGING SYSTEM: ALTERNATOR/GENERATOR ETX680C UNIVERSAL 60 or less ETX680 UNIVERSAL 60 or less ETX900 UNIVERSAL 80 or less ETX1200 UNIVERSAL 120 or less