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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesTDK has announced a ceramic-based solid-state battery material intended for wearables such as smartwatches, but there is no public confirmation that it is in any Apple Watch. TDK says the material reaches 1,000 Wh/L—about 100 times the energy density of one of its earlier solid-state batteries. That is not a promise of 100 times longer Apple Watch battery life.
What TDK announced
On June 17, 2024, TDK described a next-generation material for its CeraCharge solid-state battery family. The company said it had reached an energy density of 1,000 watt-hours per litre (Wh/L), approximately 100 times that of TDK’s conventional solid-state battery. TDK listed wireless earphones, hearing aids, smartwatches and environmental sensors as intended applications, including replacement of some coin-cell primary batteries. TDK’s announcement describes an oxide-based solid electrolyte and lithium-alloy anode.
The announcement was a material-development milestone, not a finished Apple Watch battery launch. TDK said it still needed to develop the cell and package structure and advance toward mass production. It also described multilayer lamination as a way to improve capacity and said it planned to expand the operating-temperature range.
What “100×” means—and what it does not
TDK’s 100× comparison is against its own conventional solid-state battery technology. It is not a direct comparison with an Apple Watch battery, and it does not mean a watch would run 100 times longer. The 1,000 Wh/L figure is TDK’s stated energy density for the new material, not a verified rating for a complete Apple Watch battery pack.
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#1 Best Overall
![Apple Watch Series 11 [GPS 46mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/416RQ0rtsUL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Energy density describes energy relative to volume; usable runtime depends on the finished cell and the device. A battery pack also needs packaging, connections and protective and charging-management components. The final cell’s capacity, performance and production characteristics are not established by the material figure alone. Watch runtime also varies with factors such as display use, GPS, cellular connectivity, workouts, sensors and settings.
Is TDK’s new battery already in an Apple Watch?
There is no public confirmation that it is. Apple’s current Watch product pages provide battery ratings but do not identify TDK’s 1,000-Wh/L material as the battery technology in Series 11, SE 3 or Ultra 3.
Rank #2
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Rose Gold Aluminum Case with Light Blush Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31caPPnRysL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Apple does have a longstanding relationship with TDK. In a March 2026 announcement, Apple said TDK would make advanced tunnel magnetoresistance (TMR) sensors in the United States for Apple-related supply chains. That announcement concerns sensors, not the newly announced solid-state battery. A supplier relationship makes future cooperation possible, but is not evidence of a battery supply agreement. See Apple’s announcement and TDK’s related release.
How ceramic solid-state batteries differ
Conventional rechargeable lithium-ion batteries use a liquid or gel electrolyte to move ions. A solid-state design replaces that electrolyte with a solid material. TDK’s CeraCharge technology uses ceramic manufacturing techniques and a solid ceramic electrolyte. TDK says the format can support compact batteries; a solid electrolyte can also avoid the leakage associated with liquid electrolytes. These design features do not, by themselves, establish that every solid-state cell is immune to damage, degradation or safety problems.
Rank #3
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Starlight Aluminum Case with Starlight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31YiTby0pOL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
TDK already lists a small commercial CeraCharge surface-mount device: approximately 4.5 × 3.2 × 1.1 mm, rated at 1.5 V and 100 μAh. It is intended for small electronics and IoT applications, not presented as a drop-in replacement for the main rechargeable battery in an Apple Watch. Its size and specifications illustrate why an existing tiny component should not be confused with a watch-sized battery pack. See TDK’s product specifications and its CeraCharge technology overview.
What it could change in a future Apple Watch
If a finished cell delivers higher usable energy density in a form Apple can manufacture and qualify, Apple could choose how to spend that design headroom. These are possibilities, not announced plans:
Rank #4
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31Gq8SToFJL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
- Longer time between charges: keep a similar case size and devote more of its volume to energy storage. That could help with overnight tracking, travel or GPS workouts, depending on the final design and power use.
- A thinner or lighter watch: preserve a chosen battery-life target while reducing battery volume.
- More power budget for features: use the room for additional sensors, more frequent measurements, display or connectivity demands, or on-device processing.
TDK itself identifies smaller size, higher capacitance and longer operating time as intended benefits. But the company’s material-level claim does not establish a finished pack’s runtime, charging speed, lifespan, thermal behaviour or durability.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What has to happen before it can ship in a watch
Moving from a material result to a wearable battery requires a cell that fits the product and performs reliably through everyday use. TDK explicitly said further cell and package development was needed. Important steps include:
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![Apple Watch Series 11 [GPS 42mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/41s72HIk5TL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
- Designing and packaging a cell for a watch’s shape, voltage and power needs.
- Scaling multilayer construction while achieving consistent manufacturing yield and sufficient production volume.
- Validating cycle life, charging behaviour, thermal limits and performance across operating temperatures.
- Testing mechanical durability under movement, impact and water exposure, along with safety and charging-system compatibility.
- Completing product qualification and securing a supply arrangement. No Apple qualification or battery-supply agreement for this material has been announced.
Solid-state construction does not automatically make a battery cheaper, indestructible, faster-charging or longer-lived. Ceramic materials can be mechanically brittle without suitable design and packaging, and high energy density alone does not show that a cell can supply a device’s peak power demands.
Apple Watch battery life available today
Apple’s listed figures are maximum ratings, not independent test results. The U.S. Apple pages give the following battery-life figures for the current models:
| Model | Apple-rated battery life | U.S. starting price shown |
|---|---|---|
| Apple Watch SE 3 | Up to 18 hours; up to 32 hours in Low Power Mode | $249 |
| Apple Watch Series 11 | Up to 24 hours; up to 38 hours in Low Power Mode | $399 |
| Apple Watch Ultra 3 | Up to 42 hours; up to 72 hours in Low Power Mode | $799 on the detailed product page |
Ratings and prices are from Apple’s U.S. buying pages: SE 3, Series 11 and Ultra 3. Prices can vary with configuration, cellular options, taxes and promotions; check Apple’s live listing before purchase.
Should you wait to buy an Apple Watch?
Do not delay a purchase solely because of TDK’s announcement: it does not establish that the material is in a shipping Apple Watch or when it might reach one. Choose among today’s models based on their features, fit and rated endurance. SE 3 is the lower-cost option in this lineup; Series 11 is the mainstream choice; Ultra 3 has the longest listed battery life and is aimed at users who value its larger, rugged outdoor design. If battery life is your priority now, compare the Ultra 3’s rating with your needs rather than treating a future technology claim as a product specification.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
