I. Issues of Concern to Designers/Manufacturers
1. Issue Type: Design Support
Question: In Bluetooth thermometer design, after replacing lithium titanate batteries with double-layer supercapacitors, does the overall power management strategy need to be readjusted?
Answer: Yes. When using double-layer supercapacitors instead of lithium titanate batteries, the overall power management strategy does indeed need to be redesigned. The output voltage of double-layer supercapacitors decreases linearly with discharge, while lithium titanate batteries provide a relatively stable voltage. This means that the MCU and Bluetooth module may not operate stably under low voltage conditions. Therefore, it is recommended to ensure the stability of the device throughout the entire operating cycle by adding voltage monitoring circuitry, using a DC-DC voltage regulator module, or incorporating low-voltage protection and dynamic adjustment strategies in the firmware.
2. Issue Type: Design Support
Question: Will the rapid charge and discharge characteristics of double-layer supercapacitors affect the stability or signal strength of BLE broadcasting?
Answer: No. While the rapid charge-discharge characteristics of double-layer supercapacitors can provide high current for short periods, the output power may be insufficient to sustain high-power operation as the voltage drops. If the Bluetooth thermometer is used for continuous broadcasting or high-frequency data transmission, it is recommended to optimize power management, such as adjusting the broadcast interval, sampling period, or adding an energy prediction mechanism in the firmware to ensure signal stability and communication reliability.
3. Question Type: Design Support
Question: Is the operating voltage window of the double-layer supercapacitor (e.g., 2.7V or 3.8V) sufficient to cover the power requirements of the Bluetooth main control chip?
Answer: Yes. The voltage range of double-layer supercapacitors is typically 2.7V to 3.8V. During the design phase, it is necessary to confirm the minimum operating voltage and power consumption curves of the thermometer main control chip and Bluetooth module. If necessary, a boost converter can be added or a low-voltage operating mode can be adopted to ensure normal operation throughout the entire discharge cycle, avoiding power loss or restart due to voltage drop.
4. Question Type: Performance Comparison
Question: In extreme temperature environments (e.g., -40℃ to 85℃), is the performance of double-layer supercapacitors more reliable than lithium titanate batteries?
Answer: Double-layer supercapacitors generally have better reliability than lithium titanate batteries in extreme temperatures. They can operate over a wider temperature range (generally -40℃ to 85℃), exhibit less capacity decay at high and low temperatures, have a longer cycle life, and do not pose safety hazards such as thermal runaway. Because double-layer supercapacitors are physical energy storage devices, they are less affected by low temperatures and can maintain stable performance even at 85℃ or higher, demonstrating significantly better overall temperature resistance than lithium titanate batteries.
5. Question Type: Life Cycle
Question: Is there a risk of voltage decay or leakage in double-layer supercapacitors during long-term storage or transportation?
Answer: Double-layer supercapacitors exhibit self-discharge, and their voltage will gradually decrease during long-term storage or transportation. Manufacturers typically provide typical self-discharge data and recommend incorporating short-term recharging or rapid wake-up functions into the design to ensure normal operation of the device during manufacturing, transportation, and long-term standby. Hybrid supercapacitors exhibit excellent self-discharge performance, with an annual self-discharge rate of <10%; ordinary double-layer supercapacitors can be shipped uncharged and rapidly recharged within seconds.
6. Question Type: Regulatory Issue
Question: Will adopting a double-layer supercapacitor solution simplify the certification processes for EU CE, RoHS, UN38.3, etc.?
Answer: Unlike lithium titanate batteries, double-layer supercapacitors are non-chemical energy storage devices, shipped uncharged, and can be considered as general electronic products for export, requiring no complex certifications. Compared to batteries, which require multiple certifications such as CE, RoHS, and UN38.3 for export, double-layer supercapacitors only require UN38.3 and air/sea transport certification for hybrid energy storage types (hybrid supercapacitors), resulting in fewer transport restrictions, faster market launch, and a more flexible supply chain.
7. Question Type: Performance Comparison
Question: Can double-layer supercapacitors meet the energy retention requirements of Bluetooth thermometers in long-term standby mode?
Answer: In standby mode, Bluetooth thermometers operate at ultra-low microampere power consumption for the vast majority of the time, requiring milliampere peak current only during momentary Bluetooth data transmission. Double-layer supercapacitors possess ultra-high power density, supporting both short-duration low-current battery life and providing high-current pulses for Bluetooth communication. Combined with optimized firmware scheduling and power management, standby time after a single charge can be extended, ensuring a user experience comparable to traditional battery solutions.
8. Question Type: Cost Comparison
Question: From a BOM cost and manufacturing process perspective, does a double-layer supercapacitor offer a cost advantage over lithium titanate batteries?
Answer: Double-layer supercapacitors offer significant advantages over lithium titanate batteries in Bluetooth thermometers: eliminating the need for battery protection ICs and chemical battery components simplifies the manufacturing process and reduces BOM costs; higher cycle life reduces long-term maintenance expenses; and they outperform lithium titanate batteries in performance, safety, environmental friendliness, high-temperature resistance, and overall cost-effectiveness.
9. Question Type: Life Cycle
Question: In terms of equipment maintenance or replacement cycles, can double-layer supercapacitors significantly extend product lifespan?
Answer: Yes, using double-layer supercapacitors extends the overall lifespan of the thermometer and significantly reduces replacement or malfunction issues caused by battery aging. Double-layer supercapacitors store energy physically, achieving 500,000 charge-discharge cycles or more, far exceeding the product’s design lifespan. Products like YMIN’s SLX and SDS series offer a significantly longer lifespan compared to batteries, truly achieving maintenance-free operation.
II. User Concerns
1. Question Type: Performance Comparison
Question: If the Bluetooth thermometer uses a double-layer supercapacitor instead of a battery, approximately how long does it take to fully charge? Can a short charge support several cooking or temperature measurement uses?
Answer: 1. If a Bluetooth thermometer uses a double-layer supercapacitor instead of a battery, the full charge time depends mainly on the capacitor capacity and charging current. For example, a 3.8V, 1~10F double-layer supercapacitor takes several seconds to several minutes to fully charge under normal USB charging (100~500 mA). Its rapid charge and discharge characteristics allow it to support several cooking or temperature measurement uses even with a short charge. Double-layer supercapacitors also have the advantages of long cycle life and resistance to extreme temperatures.
2. Question Type: Performance Comparison
Question: Can a Bluetooth thermometer powered by a double-layer supercapacitor operate continuously during slow roasting or smoking processes lasting 6~12 hours?
Answer: Bluetooth thermometers use low-power Bluetooth chips. Double-layer supercapacitors can be fully charged quickly within seconds or minutes. Utilizing their instant-charging characteristics, double-layer supercapacitors can quickly restore power in a short time, so there’s no need to worry about battery life.
3. Question Type: Technical Principle
Question: When the double-layer supercapacitor’s energy is depleted, will the device suddenly lose power? Will it alert you to low battery early, like a battery device?
Answer: Unlike batteries, double-layer supercapacitors don’t have a discharge plateau. They exhibit linear discharge characteristics at any voltage, allowing for easier and simpler monitoring of remaining charge through voltage monitoring compared to batteries.
4. Question Type: Performance Comparison
Question: How do double-layer supercapacitors compare to lithium titanate batteries in terms of temperature resistance and reliability?
Answer: In terms of performance, double-layer supercapacitors rely on physical energy storage, making them less affected by low temperatures than lithium titanate batteries. They maintain good performance even at extreme temperatures of 85℃ or higher, significantly increasing their temperature resistance compared to lithium titanate batteries.
5. Question Type: Performance Comparison
Question: If a thermometer is not used for an extended period (e.g., several weeks), will double-layer supercapacitors be more prone to leakage or power loss than their battery counterparts?
Answer: If a hybrid supercapacitor is used, it has superior self-discharge performance, approaching that of a battery, with an annual self-discharge of <10%. Alternatively, a double-layer supercapacitor can be used, which is shipped uncharged and can be quickly fully charged within seconds.
6. Question Type: Life Cycle
Question: Will using a double-layer supercapacitor extend the overall lifespan of the thermometer? Will it reduce replacement or malfunction issues caused by battery aging?
Answer: Yes, using a double-layer supercapacitor will extend the overall lifespan of the thermometer and significantly reduce replacement or malfunction issues caused by battery aging. Double-layer supercapacitors store energy physically, achieving 500,000 charge-discharge cycles or more, far exceeding the product’s design lifespan. Products like YMIN’s SLX and SDS series offer significantly increased lifespan compared to batteries, truly achieving maintenance-free operation.
7. Question Type: Regulatory Issue
Question: Compared to battery solutions, can double-layer supercapacitors reduce restrictions on transportation, storage, or EU export certifications (such as UN38.3)?
Answer: Yes, battery exports require various complex certifications. Double-layer supercapacitors, however, utilize a physical energy storage mechanism and are shipped uncharged. They can be exported as general electronic products without any certification. Hybrid supercapacitors, being hybrid energy storage type double-layer supercapacitors, only require UN38.3 and air/sea transport certifications, and are unrestricted by either air or sea transport.
8. Question Type: Design Support
Question: Can the double-layer supercapacitor version of the thermometer still use a regular USB or mobile phone charger? Is a dedicated adapter required?
Answer: Yes, both double-layer and hybrid supercapacitors only need to have their charging voltage limited. No dedicated charging IC is needed for management. Constant current charging and constant voltage charging are sufficient, eliminating the need for complex charge/discharge management like batteries.
9. Question Type: Environmental Protection
Question: Are double-layer supercapacitor versions of products superior to battery versions in terms of environmental protection, safety, or recyclability?
Answer: Yes, all materials used in double-layer supercapacitors comply with RoHS and REACH certifications, making them truly green energy products. They offer significant advantages in terms of environmental protection and safety. None of their components contain harmful chemicals, so they do not pollute the environment, and recycling is simple. They can be recycled like any other electronic product.
10. Question Type: Environmental Protection
Question: Double-layer supercapacitors have significant advantages over lithium titanate batteries in all aspects of performance. Are they more expensive than batteries?
Answer: In Bluetooth thermometers, double-layer supercapacitors offer a greater cost-performance ratio compared to lithium titanate batteries. Whether in terms of product performance, safety, environmental friendliness, cycle life, high-temperature resistance, or cost, double-layer supercapacitors far outperform lithium titanate batteries.
Post time: Jan-14-2026