Electronic timers

[FuEl]

Hi guys..just wondering how often do the batteries of electronic timers need to be replaced..I have not replaced mine in years..

[xiggie]

timers use batteries ??????

[FuEl]

timers use batteries ??????       

Electronic timers have a backup battery in them...don't they?

[silverfish]

Yes they have. Its to keep the settings.. something like the CMOS battery.. will probably last for 4-5 years. Then I guess you have to replace the timer unless you wanna rip out the old one to replace them..