I had the same delema and bought a personal, and am going to also get a new battery for the ebirb. the personal the battery is not as strong (24hr)and needs to be changed out mutch more often where as the 406 bat. will run 48 hours better to have on the boat.
Why would it cost $300 for a battery replacement? I remember years ago having a very high cost quoted to me to replace a battery in a loran.It was very easy and inexpensive for me to do myself.What kind of tricks have they added to these things to try to force ypu to buy new.Is any thing made to last more than a few years anymore?