I just replaced the battery in my Kannad 406 ELT and the new battery has a 6 year life, Now during condition inspections you are required to replace the battery's every 2 years, The new battery kit came with a new sticker which I need to write the expiration date on, So do I write year 2022 or write 2018 and replace the sticker in two years? There is no way I am buying a new battery every 2 years.