Note: The FAA approved 24V ETX680-24-TSO designed for certified aircraft.FAA REQUIRED STATEMENT:“The conditions and test required for TSO approval of this article are minimum performance standards. Those installing this article either on or within a specific type or class of aircraft must determine that the article installation conditions are within the TSO standards. The article may be installed only according to 14 CFR part 43 or the applicable airworthiness requirements.”This battery has electronic protections (BMS) and built in thermal runaway containment and venting ability built in. Additionally, he ETX680-24-TSO meets all of the DO-311a and DO-160G requirements for a lithium battery in aircraft.This battery is fully protected by an integrated battery management system (BMS). The BMS protects the cell’s from over discharge, over charge, short circuit, temperature, plus cell balancing to ensure charge levels are equal. Additionally, ETX-Hundred-Series aircraft batteries have redundant electronic circuits and battery fault indication. Also, this battery has fault indication that can be programed into your EFIS or wired to an LED on your panel. The fault indicator alerts 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