AG0 / LR521 Batteries
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Micro-size alkaline batteries AG0 or LR521 (1.5V, 10mAh) embody the smallest engineering format with a 5.8 mm diameter and an "Anti-Leak" steel housing, providing stable power for the smallest micro-sensors.
The AG0 battery (IEC code LR521) is the narrowest available alkaline cell (only 5.8 mm in diameter and 2.15 mm in thickness). VIDEX engineering developed it for specific ultra-compact equipment, such as hearing aid elements, special blood pressure sensors, and miniature watch mechanisms. With a 10mAh capacity designed for long-term slow discharge (Continuous 24h discharge at 68000 Ohms), this 1.5V element maintains perfect voltage stability for months. Safety against oxidation and the evaporation of chemical compounds is provided by a durable galvanized steel encapsulation and polymer seal (Anti-Leak). It does not contain environmentally harmful mercury and cadmium.
Profile of AG0 / LR521 Engineering Advantages:
- Absolute Micro-Format (5.8 x 2.15 mm): The smallest available base in industry standards allows for the creation of even more invisibly small and ergonomic electronics.
- Reliable 10mAh Discharge: "Low-drain" alkaline chemistry stably yields charge, protecting sensitive indicators from interruptions.
- Safe Anti-Leak Seal: Provides peace of mind knowing that even after a long period of downtime, the battery will not release an electrolyte leak onto the device's micro-contacts.
The more compact the power source, the more discreet your device can be. When servicing fine watches or hearing aids with microscopic power models, we recommend maintaining an uninterrupted inventory base. If you are looking for wider choices for specific equipment with different formats, check out our related LR1 / 4LR44 / A544 batteries.
Q: What are the extreme physical dimensions of the AG0 / LR521 battery and its main function?
Q: Why is micro-format power necessary in medical endoscopic (pill) cameras?
Q: How does VIDEX ensure airtightness in such a microscopic battery as the LR521 (AG0)?
Q: How does the micro (10 mAh) capacity affect the replacement frequency of the AG0 battery in luxury watches?
Q: What should be done if a pet (or child) accidentally swallows a miniature battery like the AG0?
A: The AG0 (known as 379A) is the smallest 1.5V coin cell format in the world – 5.8 mm in diameter and only 2.15 mm thick, providing an extremely small capacity (around 10 mAh). This nano-format is designed for special medical micro-implants and ultra-mini quartz mechanisms, where even a fraction of a millimeter in width is critical.
Q: Why is micro-format power necessary in medical endoscopic (pill) cameras?
A: The capsule swallowed by the patient must be as small as possible (under 10 mm in thickness) to safely pass through the digestive tract. To power the micro-camera and wireless transmitter during its short 8–10 hour duty cycle, multiple 5.8 mm (AG0 format) batteries connected in series are used.
Q: How does VIDEX ensure airtightness in such a microscopic battery as the LR521 (AG0)?
A: Despite the tiny 5.8 mm diameter, the AG0 model integrates the same two-stage nylon seal as in the large formats. This extremely precise metalworking and polymer sealing protects expensive watch and sensor micro-mechanisms from corrosive alkali (electrolyte) leaks even at the end of complete discharge.
Q: How does the micro (10 mAh) capacity affect the replacement frequency of the AG0 battery in luxury watches?
A: Even with the strictest Low-Drain quartz motor optimization, the physical energy limit (10 mAh) in luxury watches requires regular service. The AG0 (or silver oxide SR521SW) battery typically provides up to one year of autonomy, after which preventive replacement is necessary before the voltage drops entirely below 1.2V.
Q: What should be done if a pet (or child) accidentally swallows a miniature battery like the AG0?
A: Despite its 5.8 mm size, it is still an electrochemically active (1.5V) device which, upon contact with stomach acid, causes severe internal chemical burns. This is a medical emergency – you must go to the nearest hospital immediately for an X-ray, without waiting for any poisoning symptoms to appear.
