Ron, I have been issued, and have used, the RSA SecurID in both the keyfob and card for corporate intranet access since 2000. Battery life is 3 to 4 years, based on my experience, as the SecurID Fob issued to me in early 2002 lasted until mid 2006. My current employer has a standard 3 year replacement procedure that I just went through.
That's why I love this forum. Response is so quick!