Originally Posted by Canadian_JOY
Ryan - I think you may have posted this same question to the GNS480 Yahoo discussion forum? If so, you received a good reply there.
Yes this is a common problem - the memory backup battery only lasts so long. Replacement of the battery is definitely within the realm of the savvy DYI'er. Check the archives on the yahoo discussion forum - there's LOTS of detailed info there, including an excellent write-up with photos.
Good luck with getting this replaced. Gotta keep those 480's soldiering on!
I did and thanks.. even a you tube video of how to do it.
Ryan Allen, CFII
RV7 N612RA, flying since july 2012
RV10 Tail Kit complete, Wings 98%, Working on Fuselage, AEIO-540 on the stand
Acro Sport 2, building