I need to know what is the battery of casio wave ceptor 3054 and how many does it use?

From the stores online saling batteries for this watch they keep recommending a Maxell CR1620. You can most likely find one in one of your big box stores such as Target, or Kmart. Sadly the Casio user manuals don't have a tech specs page so they don't list what size batteries thier modules use. It would have been so simple to print CR1620 on the back of the case. Guess they would rather have us all run to a pawn shop or jewelry store to have it changed for around $8 or more. Guess that's why you see so any dead watches in charity stores such as Goodwill. Why pay $8+ for something that may not work then you can buy a watch at Walmart starting at around $12.

Check out this link: you have to scroll to the bottom of the screen to find the 'Next Page' to click on and progress through the manual
http://mygshock.com/casio-manual/3054/