I changed mine once when it got all wonky and told me I weighed 172 pounds. As much as I WANTED to believe I had lost like 50 pounds overnight... I bit the bullet and changed it
On my own personal journey I started on September 27, 2008
Starting weight 377, Weight in spring of 2010 198, Weight in August 2011? In the 240's.
Still plugging along on this weight loss highway!
Started 4/14/08 LINK TO PROGRESS PICS 1/1/2009
"It is impossible to live pleasurably without living wisely, well, and justly, and it is impossible to live wisely, well, and justly without living pleasurably" Epicurus
I started getting on it every day about 16-17 months ago, and I have only changed the battery once in that time. When it wouldn't turn on, or at least the lit numbers were really dim -- not remembering right now. The numbers weren't different, though.
Started Aug 08/Maintaining since Oct 09 Monday morning maintenance weigh-in
12/5/11: 146 pounds
I've had mine for years, although have not always used it regularly. I've never changed the batteries - I think they were lithium and not a normal battery, but of course, I don't have the paperwork anymore.
It's digital so I guess I figured it would either say it was low or just die on me and then I'd worry about it.