Description
A 4V 0.4Ah (or 400mAh) battery is a small, rechargeable, sealed lead-acid battery, meaning it’s maintenance-free and can be used in any orientation without leaking. The “4V” indicates its nominal voltage, while the “0.4Ah” (ampere-hour) specifies its capacity, determining how long it can power a device. This type of battery is common in small electronic devices like emergency lights, mosquito rackets, and portable torches.
Key Characteristics:
Voltage (4V):
The nominal voltage, representing the electrical potential difference it provides.
Capacity (0.4Ah or 400mAh):
This is a measure of how much electrical charge the battery can store and deliver. A higher Ah rating generally means longer run time.
Rechargeable:
The battery can be recharged and used multiple times, extending its lifespan.
Type (Sealed Lead-Acid/VRLA):
Often using Absorbent Glass Mat (AGM) technology, these batteries are maintenance-free, require no water top-ups, and are leak-proof.
Common Applications:
Due to their compact size and safety features, they are frequently used in:
Emergency lights
Mosquito rackets
Portable torches
Other small electronic appliances
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