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Views: 0 Author: Site Editor Publish Time: 2026-05-14 Origin: Site
The LR20 battery, commonly known as the Size D battery, is a widely used high‑capacity alkaline dry battery in daily households and small electrical devices. Thanks to its stable high‑current output, long service life and reliable safety performance, LR20 alkaline batteries have become the standard power source for gas stoves, gas water heaters and other essential home appliances. This article will introduce the features, specifications, working principles and application tips of LR20 alkaline batteries in detail.
LR20 follows international Size D standard dimensions, with a typical diameter of 34.2 mm and height of 61.5 mm. It adopts alkaline manganese‑dioxide‑zinc chemistry, delivering a nominal voltage of 1.5 V. Compared with traditional carbon‑zinc D‑size batteries, LR20 features larger capacity, stronger discharge performance and lower self‑discharge rate. Under normal room‑temperature storage, it can maintain stable performance for several years, which greatly reduces the frequency of battery replacement.
High‑Capacity & Long‑Lasting Power
Alkaline chemistry enables LR20 to supply continuous high current. For gas stoves and water heaters, which require instant high‑power ignition, LR20 provides stable ignition energy without power shortage during long‑term use.
Excellent Low‑Temperature Performance
It works steadily in normal household temperature ranges, suitable for kitchens and bathrooms with humid or temperature‑changing environments, ensuring normal ignition in winter.
Leak‑Resistant & Safe Structure
Qualified LR20 alkaline batteries adopt anti‑leakage sealing design. They effectively prevent electrolyte leakage caused by long‑term use, avoiding corrosion to ignition circuits and metal parts of home appliances.
Low Self‑Discharge Rate
When not in use, LR20 consumes little power. It can be stored for a long time while keeping most capacity, ideal for standby power supply of home gas equipment.
Gas stoves and gas water heaters rely on pulse ignition systems, which need instantaneous high‑current pulses to generate sparks. Ordinary low‑power carbon batteries often suffer from weak ignition, slow spark generation or short service life.
LR20 alkaline battery perfectly matches the power demand of these devices. It supports frequent ignition operations, maintains stable pulse output, and greatly extends the service cycle compared with carbon batteries. Besides home gas equipment, LR20 is also widely used in flashlights, large‑size toys, emergency lighting and other high‑power portable devices.
Use matched LR20 alkaline batteries; do not mix alkaline batteries with carbon‑zinc batteries.
Replace batteries in pairs to avoid voltage mismatch affecting ignition effect.
Remove batteries if the appliance will not be used for a long time to prevent leakage damage.
Keep batteries away from high‑temperature, humid environments and direct sunlight.
As a classic Size D high‑capacity alkaline battery, LR20 stands out for its stable performance, long life and high safety. It is the preferred power supply for household gas stoves and water heaters. Choosing reliable LR20 alkaline batteries ensures stable ignition performance, improves user experience and guarantees safe daily use of home gas appliances.
