I purchased this PFD March 29, 2021.  I just got around to reading the instruction of how to charge it so I could start using it. In the instructions it states that the date on the bobbin should not be more than 3 years from today's date.  The date on the bobbin is April 29, 2018. Not quite 3 years from the date of purchase but definitely more than 3 years from today, 9/1/21. Being ignorant of how these pfd work, is this significant? Sould I go buy a replacement kit before using?