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BPI Nickel-Metal Hydride (NiMH) Battery Pack—The Reliable Choice for Backup Power of Electric Door and Window Locks

By BPI May 11, 2026
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    With the rapid popularization of smart buildings and smart homes, electric doors and windows as well as smart door locks have become standard configurations in modern residences and commercial spaces. The stable operation of these devices relies on a safe and reliable backup power supply system.


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    NiMH batteries have become the top choice for backup power of electric door and window locks, thanks to their unique internal structure and PACK design. In terms of cell core, BPI NiMH cells adopt a low self-discharge process, endowing the battery with four core advantages:

    1. Inherent Safety: Aqueous electrolyte, tolerant to prolonged floating charging.

    2. Excellent Over-Discharge Resistance: High recovery rate of electrical performance after charging, with extremely low failure risk.

    3.  Wide Temperature Adaptability: Normal operation in extreme environments from -40℃ to 90℃, adapting to diverse usage scenarios such as high temperatures in southern China and low temperatures in northern China.

    4. Ultra-long Storage Life: BPI’s super low self-discharge series achieves over 70% charge retention at room temperature for 10 years, significantly reducing maintenance costs for devices left idle for extended periods.


    The 24V NiMH battery pack customized for electric door and window locks undergoes rigorous adaptation design in the PACK process. By connecting 20 cells in series, the 1.2V single NiMH cell voltage is boosted to 24V, fully meeting the driving voltage requirements of electric door and window locks. Meanwhile, intelligent capacity sorting technology is applied during PACK to ensure consistent capacity and internal resistance of each cell, preventing overall performance degradation of the battery pack caused by individual cell discrepancies. In addition, overcharge, overdischarge and short-circuit protection structures are integrated into the battery pack. Combined with a patented explosion-proof system (explosion-proof cap + 140℃ soluble sealing ring), a multi-layer safety barrier is established, eliminating potential power safety hazards during device operation. This combination of high-quality cells + professional PACK enables the battery pack to maintain stable output during long-term cyclic use, perfectly meeting the backup power demands of electric door and window locks.


    As key equipment for building security and smart homes, electric door and window locks mainly include smart access control locks, electric sliding door and window locks, fire emergency door and window locks, garage door electronic locks and commercial roller door electronic locks. The core pain points of these devices are: when mains power fails, the backup power must start quickly to drive the motor to complete unlocking/door-closing actions, while boasting long-term standby, maintenance-free and high-safety features. The BPI 24V NiMH battery pack is tailor-made to address these scenario-specific pain points.


    Power issues are one of the main causes of failures in the actual use of electric door and window locks, manifesting mainly as follows:

    1. Failure to drive the motor during mains power outage: Ordinary batteries have insufficient capacity or rapid voltage attenuation, resulting in inadequate starting current for the motor and failure to complete unlocking actions, hindering emergency escape or normal passage.

    2. Battery leakage/expansion damaging equipment: Low-quality batteries are prone to leakage and expansion under high temperatures or overcharging, corroding internal circuits of door locks and even posing short-circuit risks.

    3. Failure after long-term storage: Ordinary NiMH batteries have a high self-discharge rate and lose sufficient capacity after 1-2 years of storage, failing to provide effective power during mains power outages.


    Targeting these pain points, the BPI 24V NiMH battery pack delivers comprehensive adaptation through technological optimization:

    1. Stable Voltage Output: A 24V voltage platform formed by 20 cells in series fully matches the rated voltage of electric door and window lock motors. Coupled with high-rate discharge performance, it provides a stable starting current to ensure normal device operation during mains power outages.

    2. Patented Safety Protection: Patented explosion-proof cap technology + PACK protection circuit completely eliminates leakage and explosion risks, adapting to the enclosed and compact installation environment inside door locks.

    3. Ultra-low Self-discharge Performance: BPI’s super low self-discharge technology enables the battery pack to maintain sufficient power during long-term storage at room temperature, eliminating the need for frequent replacement and maintenance.


    The BPI NiMH battery pack is widely compatible with the following types of electric door and window locks: fire emergency electric door and window locks, smart access control and electric sliding door locks, garage door and roller door electronic locks, and industrial plant explosion-proof door and window locks. In these scenarios, the BPI NiMH battery pack stands out as the optimal choice for backup power of electric door and window locks with its safe, stable and maintenance-free features. It not only resolves the operational issues of devices during mains power outages but also safeguards the long-term stable operation of devices through patented safety technology and full-series certifications.


    From patented explosion-proof technology and full-series international certifications to 24 years of NiMH manufacturing experience and customized PACK solutions, BPI addresses all backup power requirements of the electric door and window lock sector with its strengths rooted in safety, centered on performance and focused on adaptation.


    Always customer-centric, we leverage industry-leading technical capabilities and stringent quality control to provide global customers with NiMH battery products tailored for diverse scenarios, empowering electric door and window lock devices to deliver safer, more stable and longer-lasting performance.
    References
    Shenzhen Better Power Battery Co., Ltd.
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