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Views: 0 Author: Site Editor Publish Time: 2026-05-11 Origin: Site
LR14 alkaline‑manganese batteries, also known as C‑size or No.2 alkaline batteries, are widely used primary power sources for medium‑power portable devices. Many users pay close attention to three core indicators when choosing batteries: operating voltage, actual capacity, and service life. These three factors directly determine whether the battery can meet the power needs of equipment. This article deeply analyzes the voltage characteristics, capacity parameters and service life performance of LR14 alkaline‑manganese batteries, helping users fully understand its core performance.
The nominal voltage of a standard LR14 alkaline‑manganese battery is 1.5 V, which is consistent with common AA and AAA alkaline batteries. However, its actual working voltage changes regularly during discharge, showing obvious advantages over traditional carbon‑zinc batteries.
Open‑circuit voltage: About 1.58 V for new batteries, stable at room temperature.
Working discharge voltage: Maintains 1.40 V–1.50 V in most discharge cycles, presenting a flat discharge curve. Unlike carbon‑zinc batteries whose voltage drops rapidly, LR14 keeps stable output for a long time.
Cut‑off voltage: Generally 0.9 V–1.0 V. When the voltage drops to this range, the battery is basically exhausted and cannot support normal operation of devices.
Voltage stability: Even under continuous high‑current discharge, the voltage fluctuation is small, suitable for precision instruments and electronic equipment sensitive to voltage changes.
Capacity refers to the total electric energy a battery can output, measured in mAh (milliampere‑hour). The actual capacity of LR14 varies with discharge current, temperature and environment.
Standard nominal capacity: Under standard conditions of 25 °C ambient temperature and 200 mA constant discharge current, the typical capacity of LR14 alkaline‑manganese batteries is 4000–5000 mAh.
Low‑drain capacity: For low‑power devices such as remote controls and sensors, the discharge current is small, and the actual capacity can reach 5500–6000 mAh with longer continuous working time.
High‑drain capacity: For high‑power devices like large toys and portable speakers, the discharge current increases, and the available capacity will decrease slightly to about 3500–4200 mAh.
Temperature influence: Capacity drops by 20%–30% at −10 °C or below; high temperature above 40 °C accelerates chemical reaction and shortens available capacity.
Compared with R14 carbon‑zinc batteries (only 1500–2000 mAh), LR14 has more than twice the capacity and stronger power supply capability.
Service life of LR14 includes two key parts: working life (usage time) and shelf life (storage life).
Working life depends on the power consumption of equipment:
Low‑power devices (sensors, doorbells): Can work continuously for several months to more than one year.
Medium‑power devices (flashlights, radios): Continuous use for dozens to hundreds of hours.
High‑power devices (large electric toys): Continuous use for tens of hours.
Thanks to high capacity and stable discharge, LR14 provides much longer working life than ordinary carbon‑zinc batteries.
LR14 alkaline‑manganese batteries have extremely low self‑discharge rate:
Annual self‑discharge rate is less than 2% under cool and dry storage.
Normal shelf life: 5–7 years; high‑quality LR14 can reach 10 years.
Long‑term storage will not cause rapid power loss or leakage, suitable for backup power of emergency equipment.
Discharge current: Higher current leads to faster voltage drop and lower effective capacity.
Ambient temperature: Too low or too high temperature reduces capacity and shortens working life.
Battery matching: Mixing different types of batteries causes abnormal voltage and accelerates power consumption.
Storage environment: Humidity and high temperature increase self‑discharge and shorten shelf life.
LR14 alkaline‑manganese batteries rely on stable 1.5 V discharge voltage, high 4000–5000 mAh standard capacity and long‑lasting working & shelf life, becoming the preferred power supply for medium‑power equipment. Understanding its voltage changes, capacity characteristics and service life rules can help users select reasonably, extend equipment running time and improve overall use efficiency.
