Panasonic Secondary Battery CTL1616 for Casio This is the Panasonic CTL1616 cobalt titanium lithium secondary battery (rechargeable battery), often used in solar-powered watches. Button-type rechargeable batteries have limited distribution channels in Japan, and are only shipped to equipment manufacturers. Since genuine products cannot be purchased anywhere, we have imported them in parallel from overseas. We have selected reliable suppliers and sell products manufactured within the last two years. We have used these batteries for battery replacements in the G-SHOCK GW-M5610, G-5600A, G-5600E, and WAVE CEPTOR WVA-430J. Please check for yourself if they are compatible with models other than the above. You can tell by opening the back of your watch. ★Shipping Yu-packet Post Mini shipping. Multiple items can be shipped together. Please comment if you'd like to combine shipping, as it's more economical. Due to changes in Mercari regulations, mailing is no longer possible. The following is know-how accumulated from past transactions. Please read it, although it's lengthy. ◎Most Important ・Keep out of reach of children. ・If swallowed, seek medical attention immediately. There have been deaths in the United States due to perforation of the stomach and intestines. ★Prohibited ・Do not handle with metal tweezers. ・Do not deform, disassemble, or directly solder to the terminals. ★Caution ・To prevent misuse, battery manufacturers recommend welding dedicated terminals, and watch manufacturers use batteries with terminals welded specifically for each company. The markings on the battery body are the same, so be careful not to confuse them. (Calculator manufacturers ignore this and use batteries without terminals.) ・There are no parts sales, so genuine Casio parts do not exist. (The retail label states "genuine parts," so we have edited the photos to avoid misunderstanding.) ・The nominal voltage is 2.3v, which is unusual, so a three-stage battery checker will display "no capacity." ・Do not measure the voltage with an analog tester. (Following the tester's manual and measuring from a high range will result in low capacity and complete discharge. Digital testers with auto-ranging are acceptable.) ★Other ・The batteries we handle are new, and we do not measure the voltage of rechargeable batteries because it is meaningless. Instead, we check the manufacturing date of all batteries. ・Technical skill is required for replacement. To provide them at a low price, we focus on selling parts and do not provide installation support.