The Yuasa NP4-6 is a high-quality 6V 4Ah Valve Regulated Lead-Acid (VRLA) battery designed for dependable standby power applications. As part of the trusted Yuasa NP Series, this sealed rechargeable battery delivers reliable performance across a wide range of fire safety, security and emergency power systems. It is commonly used in fire alarm panels, intruder alarm systems, emergency lighting units, access control equipment and other standby applications requiring a compact and dependable power source.

Features

• EUROBAT Classification: 3 to 5 years 'Standard Commercial'
• High rate discharge performance VRLA battery
• Lead Calcium Grids for superior life
• Absorbed Glass Mat construction with no free acid
• Gas recombination
• Good recovery from deep discharge
• Can be installed and operated in orientations up to 90° from the upright position
• 6V 4Ah VRLA rechargeable battery
• Proven AGM technology with no free acid
• Maintenance-free sealed construction
• Reliable standby power performance
• Lead-calcium grids for extended service life
• Operates in any orientation except permanently inverted
• Trusted Yuasa NP Series quality

Yuasa batteries cannot be used for wind power generation equipment pitch control applications (at the rotor section).

Proven AGM Technology

The NP4-6 utilises Absorbed Glass Mat (AGM) technology, where the electrolyte is held within a fine glass fibre separator rather than existing as free liquid acid. This sealed construction helps prevent leakage and allows the battery to operate safely and efficiently in demanding standby environments. The battery incorporates advanced gas recombination technology, reducing maintenance requirements and supporting long-term reliability.

Designed for Standby Applications

Yuasa's NP range has been developed specifically for standby and light cyclic use, making the NP4-6 suitable for life safety and security equipment that requires a dependable source of backup power. Lead-calcium grids provide excellent durability and service life, while the battery's design offers strong recovery characteristics following deep discharge events.

The battery can be installed and operated in any orientation except permanently inverted, providing flexibility where installation space may be limited.

Compact and Practical Design

With a nominal voltage of 6V and a capacity of 4Ah (20-hour rate), the Yuasa NP4-6 offers an excellent balance of performance and compact sizing. Measuring approximately 70mm (L) × 47mm (W) × 105.5mm (H) and weighing around 0.87kg, it is well suited to equipment with restricted battery compartments. The battery is fitted with 4.75mm Faston quick-connect terminals for straightforward installation and replacement.

Service Life and Reliability

The Yuasa NP4-6 carries a EUROBAT classification of 3 to 5 years (Standard Commercial) and has a design life of up to 5 years when operated at 20°C under recommended charging and operating conditions. Actual service life will vary depending on factors such as ambient temperature, charging regime, discharge depth and application.

Typical Applications

• Fire alarm systems
• Intruder and security alarm systems
• Emergency lighting systems
• Access control equipment
• Door entry systems
• Communication equipment
• Backup and standby power systems
• General industrial and commercial standby applications

The Yuasa NP4-6 is a proven and dependable choice for fire, security and emergency power applications where a compact, maintenance-free sealed lead-acid battery is required.