The internal battery expiration date is written somewhere on the unit. Mine
just expired.

--
Dennis Gibbons
S/V Dark Lady
CN35-207
email: dennis dash gibbons at worldnet dot att dot net
"Oliver Fleming" wrote in message
...
Hi,
I think they are good for 10 years but must be replaced at 5
years.

Cheers
Oliver Fleming

"Steve" wrote in message
...
What is the expiration date on the battery??

Steve
s/v Good Intentions