How do you choose a coin cell battery for your car key? Take a look at Power Glory's CR-PH series.
How do you choose a coin cell battery for your car key? Take a look at Power Glory's CR-PH series.
Have you ever encountered any of these situations—
• The range of your car key fob keeps getting shorter, and you have to press the button several times right in front of the car before it responds;
• Just a few months after replacing the battery, it’s back to being “half-dead”;
• Batteries bought online either sit loosely and cause poor contact, or are so thick that the back cover won’t close.
Many car owners assume that since car key batteries are 3V and look like buttons, they can just buy any one and swap it in. But the reality is that car keys have specific requirements for battery size precision and pulse discharge capability. Choosing the wrong model can result in anything from a malfunctioning remote to damage to the key’s circuit board.
Today, based on the actual power requirements of car keys, we’ll discuss the CR-PH series of button-cell batteries from Power Glory—specifically designed for high-pulse, long-lasting applications—to help you make the right choice the first time.
I. What Kind of Battery Does a Car Key Actually Need?
Car keys have a unique power consumption pattern: they remain in a dormant standby state most of the time, with extremely low power consumption; however, when you press a button or the PEPS keyless entry system is triggered, the battery must instantly release a sufficient pulse current—in a matter of milliseconds—to drive the RF module to transmit a signal.
This places two core requirements on the battery:
1. The dimensions must match precisely—even a 0.1 mm difference in diameter or thickness can cause poor contact or prevent proper installation;
2. The pulse discharge capacity must be strong enough—especially for smart keys with one-touch start, remote vehicle locator, and UWB digital key functions, where the peak current during RF transmission is higher, and standard batteries are prone to sudden voltage drops and signal loss.
The last four digits of the “CR” designation represent the size code: the first two digits = diameter (mm), the last two digits = thickness × 10 (mm).
For example, CR2032 has a diameter of 20 mm and a thickness of 3.2 mm, while CR2450 has a diameter of 24.5 mm and a thickness of 5.0 mm. Batteries of different sizes must never be interchanged, nor should models with the same diameter but different thicknesses be mixed.
In particular, the new generation of UWB (Ultra-Wideband) digital keys has higher requirements for pulse current than traditional remote keys. If the original battery is labeled with the “PH” suffix, it is recommended to continue using the “PH” version when replacing it to ensure the stable and reliable operation of features such as keyless entry and proximity unlocking.
II. Why Are PH-Type Button Batteries Better Suited for Smart Keys?
In Power Glory’s CR series naming convention, “PH” stands for two key performance dimensions:
P = High Power (High Power / High Pulse)
Through optimized material formulations and structural design, the PH series achieves a maximum pulse discharge current that is approximately 20% higher than that of standard batteries of the same size. In scenarios requiring an “instantaneous burst” of power—such as pressing the unlock button, waking up the PEPS system, or transmitting UWB signals—the PH series delivers a more stable instantaneous voltage, preventing reduced remote control range, sluggish response, or signal loss caused by sudden voltage drops.
H = High Capacity
For the same size, the PH series offers a nominal capacity approximately 10% to 20% higher than standard models. This increase in capacity directly translates to longer replacement intervals—for frequently used smart keys, this means fewer replacements and more consistent long-term performance.
In a nutshell: The standard CR model is “adequate and reliable,” while the PH series offers “stronger pulses and higher capacity for the same size.” If your car uses a basic remote key, the standard model is perfectly sufficient; if it features push-button start, keyless entry, UWB digital keys, or similar functions, the PH series is the better choice.
III. Complete Overview of Power Glory CR-PH Series Car Key Button Battery Models
The Power Glory CR-PH series covers the mainstream sizes of car keys on the market, with corresponding models ranging from ultra-thin key fobs to large smart keys.
Model | Dimensions (mm) | Capacity | Compatible Vehicle Models / Key Types |
CR2032PH | 20 × 3.2 | 245 mAh | Fits the vast majority of household car models on the market; main model for UWB smart keys |
CR2025PH | 20 × 2.5 | 165 mAh | Select older car models, compact key housings |
CR2450PH | 24.5 × 5.0 | 620 mAh | Most BMW smart keys, select older NIO keys; large diameter and thickness, cannot be replaced by 20-series batteries |
CR2430PH | 24.5 × 3.0 | 300 mAh | Older Volvo keys, select Jaguar Land Rover keys |
CR1632PH | 16 × 3.2 | 140 mAh | Select Haval keys, older Mazda keys |
CR1620PH | 16 × 2.0 | 80 mAh | Dedicated to ultra-compact key housings |
IV. Four Major Technical Advantages of the CR-PH Series
1. High-Pulse Discharge
Maximum pulse current ranges from 10 to 28 mA (depending on the model), meeting the instantaneous transmission requirements of RF modules and ensuring “instant response” to remote control commands.
2. High Capacity and Long Battery Life
Capacity is 10% to 20% higher than standard models of the same size, reducing the frequency of battery replacements and providing greater peace of mind during long-term use.
3. Ultra-Low Self-Discharge
Thanks to unique packaging technology, the annual self-discharge rate is less than 2%. The battery remains stable even after long-term storage, providing peace of mind for both inventory and backup use.
4. Stable Output Across a Wide Temperature Range
Operating temperature range: -20°C to +70°C. It withstands intense summer heat inside vehicles and cold winter conditions, maintaining stable voltage output in both hot and cold environments.
V. Beyond the PH Series—Power Glory’s Full Product Line Covers More In-Vehicle Scenarios
The CR-PH series is Power Glory’s flagship product designed for normal-temperature, high-pulse consumer applications, but Power Glory’s CR product line extends far beyond that. Different in-vehicle environments place varying emphasis on battery temperature performance:
• CR Standard Series
Meets the daily needs of basic remote key fobs, offering stable performance and high cost-effectiveness. Operating temperature range: -20°C to +70°C, covering standard usage environments.
• CR-PH High-Capacity Model
Offers stronger pulses and higher capacity within the same form factor, making it suitable for high-power-consumption smart keys such as push-button start, PEPS, and UWB digital keys.
• CR-HT Wide-Temperature Model
Operating temperature range: -40°C to +125°C. Specifically designed for in-vehicle devices installed inside tires—such as TPMS tire pressure sensors—that must withstand extreme high temperatures.
• CR-T Wide Temperature Range Type
Operating temperature: -40°C to +85°C. Suitable for outdoor IoT sensors, industrial control systems, and other scenarios requiring a wide temperature range but not necessitating the 125°C limit.
• CR-D Low-Temperature Resistant Type
Operating temperature as low as -55°C. Designed for ultra-low-temperature applications such as cold-chain logistics, electronic price tags for refrigerated cabinets, and equipment in extremely cold environments.
Selection Recommendations: For everyday car key remote control applications, both the CR Standard Series and the CR-PH Series are suitable—prioritize the PH Series for smart keys, while the Standard Series is sufficient for basic remote keys. For internal tire components such as TPMS (Tire Pressure Monitoring System) sensors, the CR-HT Wide Temperature Series must be used; standard-temperature batteries cannot be substituted. Each series has a distinct positioning and specific strengths, collectively forming Power Glory’s comprehensive in-vehicle power solutions.
VI. Power Glory: 22 Years of Expertise in Lithium Micro Batteries
Power Glory has been deeply involved in the lithium micro battery sector for over 20 years. It is a nationally recognized “Little Giant” enterprise under the Specialized, Refined, Distinctive, and Innovative program and a drafting entity for national standards on primary batteries. The company is one of the world’s leading manufacturers of lithium micro batteries, offering the most comprehensive range of categories, models, and specifications.
22 Years of Dedication to Lithium Micro Batteries
Monthly Production Capacity: Over 66 million units
Approx. 60% Exported Overseas
91 Patents
Certifications: IATF 16949, ISO 9001, ISO 14001, ISO 45001, ISO 50001, QC080000, UL, CE, UN38.3, IEC, RoHS
VII. Replacing Car Key Batteries
1. Check the model number—don’t guess it.
After removing the key’s back cover, immediately check the complete model number engraved on the old battery, such as CR2025, CR2032, or CR2450. If the original battery is labeled CR2032PH, we recommend selecting the PH version; if labeled with a standard model number, either the standard or PH version can be used, though the PH version offers better battery life and pulse performance.
2. Choose a brand; don’t go for the cheapest option.
Prioritize products from reputable major manufacturers with IATF 16949 automotive certification and a comprehensive international certification system. Power Glory has a monthly production capacity exceeding 66 million units. With fully automated production lines and a visual inspection system, every battery undergoes strict consistency testing before leaving the factory.
VIII. Conclusion
When it comes to car key batteries, the size must be correct, the pulse capacity must be sufficient, and the total capacity must be adequate. Power Glory’s CR-PH series—covering all seven mainstream car key sizes—offers high pulse capacity, high total capacity, and low self-discharge, providing more stable power support for smart key applications such as push-button start, PEPS, and UWB digital keys. Additionally, Power Glory’s CR Standard Series and CR-HT Wide Temperature Series are designed for different application scenarios, forming a comprehensive lineup of automotive power products.
Before replacing your battery next time, take a closer look at the model number on your old battery—choosing the right one is the key to a long-lasting solution.
