Casio CTL920 in our DIY Kit with tools

Your other option is to return the watch to the factory for an expert tune-up and we recommend this if you don't mind the expense because they will fully clean and pressure test (if necessary), put new seals and a new capacitor and guarantee their work. They may not give a price over the phone and ask you to send it with a prepaid return. This is fair because they have to evaluate the condition in order to price-out the solution. 

Our solution is low cost and fast and is for those who have watched the YouTube videos and are confident of a DIY solution. We do not recommend using a store or kiosk because of their inexperience. Either do it yourself or return to the factory for a trusted tune-up; don't be otherwise sorry with an expensive botched job or incompetence.

Please before you order compare our image with your existing power cell; the CTL920 power cell has many Citizen versions which are not interchangeable. Each CTL920 Citizen version is designed for a specific timepiece and caliber or watch movement. Only order after you compare and diligently verify you've selected the correct Citizen version of the CTL920 your timepiece requires. This is easy to do. We do not accept returns on opened product which are non-resaleable after being opened and handled.

Please do not use a battery tester or volt ohm meter as these cells may be ruined by testing and they may not indicate the normal voltage of a regular 1.55v disposable watch battery. Please do not handle with your fingers as static electricity, body oil and contaminants may damage the cell. Please only handle with supplied anti-static tweezers and finger cots. 

If you use a shop or kiosk they probably have never been trained or even seen a rechargeable watch battery, these are not the folks to work with. Ask if they know how to replace a rechargeable watch battery! They often will install as a replacement a regular 1.55v cell replacement which could harm your watch. Make sure you get the original power cell returned to you in a plastic bag or envelope and you mark the date on it. Follow this same procedure for rechargeable coin cells some watches use and we also sell these.

Please note that the CTL920 is the basic battery or capacitor engine for many different configurations; look at all the search results for the CTL920 and eyeball match to verify and confirm if you have any doubts. Why waste money taking your watch to a shop when you can do it yourself. These capacitors may resemble a battery but their function is very different. The capacitors on the kinetic oscillator watches recharges just by body movement while the capacitors on the solar cell watches are powered by all sources of light, outdoors and indoors. 

To repeat, the CTL920 is the basic power source and engine for a handful of watch capacitor designs. I can help you or you can visually match all the CTL920 designs to eyeball-verify the correct one (such as the Bulova CTL920). Capacitors can be used with Citizen, Miyota, Seiko, Bulova, Hattori and Casio watches designed for them. Please make sure that you are purchasing the correct battery/capacitor; please match up the first four characters (ex. 5M22, 5J32, 7820) of your movement. Your movement number can usually be found on the the case back of your watch (the model number always has a dash or hyphen i.e. "5M22-012XY" or on the movement itself inside the watch case. Please make sure to check the movement number carefully and remember we want to answer questions you might have and make sure you get the correct watch capacitor model.

" Capacitors are storage devices and do not necessarily come already fully charged. The customer needs to charge the watch after inserting the capacitor, either by oscillating motion or a Seiko Kinetic Recharger. They should not be tested - a battery tester will not give an accurate reading. Most of the time, the capacitor itself is not defective. Sometimes the brass connector may not be seated perfectly and may be the problem " Fully recharge your watch before wearing again, under sunlight in a cool location 12 hours or under a fluorescent light about 9-12" distance for at least 12 or more hours. If this does not start your watch something else may be the problem other than the power cell.  

US Government, USPS, UPS, and FedEx ban international air shipment of any lithium chemistry battery. Please do not order if you are outside the USA. Please dispose of ethically according to the rules of your Solid Waste Department. These batteries must not go into your landfill because of toxic damage to your water supply and contamination affecting all living things. Please always recycle your batteries! Do not dispose of in fire. Do not incinerate, crush, disassemble, puncture or short circuit or insert incorrectly. Do not try to retrofit and/or engineer this into any other product. Keep out of the reach of children. Do not mix types, do not mix old and new batteries. All batteries can be dangerous if not handled properly!