I just got my new epirb (jumped the que a bit) but just to let you all know GME have just announced today that their battery replacement policy is as follows. if you take in your old one in six years they will take it off you, deregister it, give you a brand new one and register it for you and you will pay the princely sum of $200.00. this is retrospective so if you bought one 5 years ago in twelve months you will get a new one for $200.