{"id":475,"date":"2026-06-12T01:17:54","date_gmt":"2026-06-12T01:17:54","guid":{"rendered":"https:\/\/www.batteryone.co.nz\/blog\/?p=475"},"modified":"2026-06-12T01:17:55","modified_gmt":"2026-06-12T01:17:55","slug":"casio-tough-solar-watch-keeps-shutting-down-replace-the-ctl920-battery","status":"publish","type":"post","link":"https:\/\/www.batteryone.co.nz\/blog\/archives\/475","title":{"rendered":"Casio Tough Solar Watch Keeps Shutting Down? Replace the CTL920 Battery"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Casio&#8217;s Tough Solar watches are known for their reliability and long-lasting performance. However, even rechargeable solar batteries eventually wear out after years of use. If your Casio AQS800W-1B2V, AQS800W-1BV, AQS800W-1EV, or AQS800WD-1EV is experiencing power issues, a new CTL920 battery may be the perfect solution.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common Signs Your CTL920 Battery Needs Replacement<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Although the CTL920 is a rechargeable lithium battery designed for solar-powered watches, its capacity gradually decreases over time. Here are some common symptoms of battery aging:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Short Battery Runtime<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A fully charged watch should operate for several months without issues. If your watch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Loses power quickly<\/li>\n\n\n\n<li>Stops running overnight<\/li>\n\n\n\n<li>Requires frequent exposure to sunlight<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.batteryone.co.nz\/detail-casio-battery-ctl920-model-pa3328ju_oth\">the CTL920 battery <\/a>may no longer be holding a proper charge.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Watch Cannot Charge Properly<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Many users notice that their Casio solar watch no longer charges even after several hours in direct sunlight.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Possible symptoms include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery level remains low<\/li>\n\n\n\n<li>Charging indicator does not improve<\/li>\n\n\n\n<li>Watch shuts down shortly after charging<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In most cases, battery degradation is the main cause.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Random Shutdowns or Display Problems<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A failing CTL920 battery may cause:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intermittent power loss<\/li>\n\n\n\n<li>Flickering display<\/li>\n\n\n\n<li>Time reset after power interruption<\/li>\n\n\n\n<li>Unresponsive buttons<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These issues often indicate insufficient battery voltage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Determine Whether the CTL920 Battery Is Damaged<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before purchasing a replacement battery, perform the following checks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Check Battery Age<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Most rechargeable watch batteries last between 5 and 10 years depending on usage and charging conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your Casio watch is several years old and has never had a battery replacement, battery wear is highly likely.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Perform a Full Solar Charge Test<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Place the watch under strong sunlight for one full day.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the charge level does not improve or quickly drops afterward, the CTL920 battery has probably reached the end of its service life.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Inspect for Physical Damage<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">During replacement, examine the battery for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corrosion<\/li>\n\n\n\n<li>Leakage<\/li>\n\n\n\n<li>Swelling<\/li>\n\n\n\n<li>Damaged contacts<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Any of these signs indicate immediate replacement is necessary.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Compatible Casio Watch Models<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The 5.5mAh CTL920 rechargeable battery is compatible with several Casio Tough Solar watches, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Casio AQS800W-1B2V<\/li>\n\n\n\n<li>Casio AQS800W-1BV<\/li>\n\n\n\n<li>Casio AQS800W-1EV<\/li>\n\n\n\n<li>Casio AQS800WD-1EV<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Always verify the original battery model before ordering.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Typical Usage Scenarios<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A new CTL920 battery helps restore reliable performance in various situations:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Daily Wear<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you&#8217;re commuting, working, or attending meetings, a fresh battery ensures accurate timekeeping without unexpected shutdowns.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Outdoor Activities<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ideal for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hiking<\/li>\n\n\n\n<li>Camping<\/li>\n\n\n\n<li>Fishing<\/li>\n\n\n\n<li>Running<\/li>\n\n\n\n<li>Cycling<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The watch can maintain stable power during extended outdoor use.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Travel and Business Trips<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A reliable battery reduces the risk of power loss when traveling, especially when access to sunlight may be limited.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Benefits of Replacing the CTL920 Battery<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Installing a new CTL920 battery offers several advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Longer operating time<\/li>\n\n\n\n<li>Improved charging efficiency<\/li>\n\n\n\n<li>Stable watch performance<\/li>\n\n\n\n<li>Reduced risk of unexpected shutdowns<\/li>\n\n\n\n<li>Extended lifespan of your Casio solar watch<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Compared with purchasing a new watch, replacing the battery is a cost-effective way to restore full functionality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your Casio AQS800W series watch suffers from short battery life, charging failures, or random shutdowns, the CTL920 rechargeable battery is often the root cause. Replacing the worn battery can quickly restore dependable performance and help your Tough Solar watch continue operating for years to come.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Choosing<a href=\"https:\/\/www.batteryone.co.nz\/detail-casio-battery-ctl920-model-pa3328ju_oth\"> a high-quality CTL920 replacement battery<\/a> ensures optimal charging performance, reliable power storage, and a longer service life for your Casio timepiece.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Casio&#8217;s Tough Solar watches are known for their reliability and long-lasting performance. However, even rechargeable solar batteries eventually wear out after years of use. If<\/p>\n","protected":false},"author":1,"featured_media":476,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[194],"class_list":["post-475","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-watch-battery","tag-casio-aqs800w-battery-replacement"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Casio Tough Solar Watch Keeps Shutting Down? 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