The Inovonics BAT851 lith-ion replacement battery assembly is used in the EN5040, EN5040-T and EN5040-20T purchased after January 1, 2023. (Note: Per ICAO regulations, Inovonics will ship all BAT851 orders with the replacement batteries at less than a 30% state of charge (SoC), maximum per-order quantity of 8 BAT851s by air cargo, and 500 BAT851s by ground.)