Question
I have a Rainjet RC204P. The 9V backup battery is discharging every 2-3 days. Once the battery is flat, one station turns on and stays on until the battery is replaced or the main power is disconnected. Any suggestions?

Answer
Hello,

Well, check to make sure the battery is not in contact with any of the terminals in the controller.  Also check to make sure the transformer is property wired in.  I would probably just go ahead and replace that controller though...You can pick up a new one for a relatively low price at a home improvement store or irrigation distributor.