What I need is the cig. lighter! It was pulled out of my plane due to the AD that came out because it wasn't on a fuse. It looks like I can get the hardware pretty cheap and my A&P says less than an hour labor. Probably worth it not just in terms of batteries but safety, particularly for night flying to keep the unit backlit. Apparently less than $100 including install.
Look at the lazy susan parts boards at an auto parts store, they will have complete lighter sockets, and I can assure you that Cessna didn't use anything special, just a regular automotive unit.
If you really want to stay perfectly legal, the complete lighter socket/lighter element assembly is.......
0513039-7 LIGHTER ASSEMBLY
(List Price: $ 11.50) Stock Available $ 10.35 (EA)
from
www.cessnaparts.com [
cessnaparts.com]
Charles