Note: Not FAA Approved. Intended for use in EXPERIMENTAL AIRCRAFT ONLY.This battery is intended for 550ci engine size or more; 120 amp alternator/generator or less. Can be used in experimental aircraft just match up the alternator output with the correct battery.This lithium battery is most commonly used for experimental aircraft and is fully protected by an integrated battery management system (BMS) that protects the cell’s from over discharge, over charge, short circuit, temperature, plus cell balancing to ensure charge levels are equal. Additionally, the ETX-Hundred Series aircraft batteries have redundant electronic circuits and battery fault indication. The fault indicator can be connected into your EFIS or wired to a 12volt LED light on your control panel to alert you to the state of charge and state of health of the battery. (Please see manual for details)Please Note: Due to shipping regulations, this battery does ship as dangerous goods outside of the 48 continental USA states.