PRODUCT SPECIFICATIONS

Brand	Yuasa
Model	NP2.1-12
Voltage	12V
Capacity	2.1Ah at 20-hour rate
Battery technology	AGM VRLA sealed lead acid
Length	178mm
Width	34mm
Height over terminals	64mm
Terminal type	Faston 4.75mm / F1 type
Weight	Approximately 0.82kg
Case	ABS plastic
Design life classification	3–5 years in standby service; actual life varies
Rechargeable	Yes

TERMINALS AND CONNECTIONS

The Yuasa NP2.1-12 uses 4.75mm Faston blade terminals, commonly referred to as F1 terminals. These are push-on blade connectors rather than round automotive battery posts.

• Terminal width: 4.75mm nominal.
• Check the terminal connector size and position against your existing battery.
• Always connect positive to positive and negative to negative.
• Confirm polarity from the battery markings and your equipment wiring before installation.

KEY FEATURES AND BENEFITS

• Trusted Yuasa brand: An established battery manufacturer with a dedicated industrial VRLA battery range.
• AGM technology: The electrolyte is absorbed into a glass-fibre separator.
• Sealed construction: No routine topping up with water is required.
• Standby power: Designed for compatible backup applications when mains power is interrupted.
• Light cyclic use: Suitable for approved applications involving occasional charging and discharging.
• Compact format: A slim 178mm × 34mm battery design.
• Low self-discharge: Helps retain stored charge; periodic inspection and recharging remain important.
• Maintenance-free operation: Convenient for compatible equipment where routine electrolyte maintenance is undesirable.
• Established specifications: A clearly identifiable model helps installers source the appropriate replacement.

APPLICATIONS AND EQUIPMENT TYPES

This battery is suitable for equipment whose manufacturer specifies a compatible 12V 2.1Ah sealed lead-acid battery with matching dimensions and terminals.

• Intruder alarm panels and alarm backup units.
• Compatible burglar alarm systems and security control equipment.
• Approved fire alarm panels and ancillary systems.
• Emergency lighting units and backup lighting equipment.
• Small UPS and uninterruptible power supply equipment designed for this battery size.
• Access control and electronic security systems.
• Monitoring equipment and low-power control panels.
• Telecommunications and other electronic standby equipment.
• Specialist instruments and devices requiring a 12V 2.1Ah AGM/VRLA battery.

Important: The application list describes compatible equipment types, not a guarantee of fit in every make or model. For fire alarms and other life-safety equipment, use only a battery approved by the equipment manufacturer.

INTERNATIONAL BATTERY CROSS-REFERENCE LIST

The following makes and model numbers appear in published replacement references for the Yuasa NP2.1-12 or its closely related 12V 2.1–2.3Ah battery format. They are useful identification and comparison references for buyers worldwide.

Compatibility notice: These references are not all identical batteries. Some have a different nominal capacity, case height, terminal arrangement or design. In particular, a 2.3Ah battery is not automatically a drop-in replacement for a 2.1Ah battery. Check voltage, dimensions, terminal type, polarity, charging requirements and equipment approval before purchasing.

OTHER BRANDS TO CHECK FOR MATCHING ALTERNATIVES

Manufacturers such as CSB, Leoch, Ritar, Kung Long and Ultramax also produce 12V AGM/VRLA batteries. However, I have not included unverified model numbers for these brands as direct NP2.1-12 equivalents. Their catalogues contain multiple sizes and capacities, and the exact model must be checked before claiming compatibility.

WHY CHOOSE YUASA?

• Recognised manufacturer with a long-established industrial battery range.
• Manufacturer technical documentation and defined product specifications.
• AGM/VRLA design for compatible standby and light cyclic applications.
• Sealed, low-maintenance construction.
• Published design-life classification of 3–5 years for the NP range in standard commercial standby service.
• Consistent model identification for maintenance and replacement planning.

Battery life and performance depend on temperature, charging conditions, discharge depth, storage and the equipment being powered. No battery brand can guarantee a particular service life in every installation.

CHARGING AND SAFETY

• Use a charger specifically designed for 12V AGM/VRLA lead-acid batteries.
• Follow the manufacturer's charging voltage and current limits.
• Avoid overcharging, short circuits and prolonged storage in a discharged state.
• Keep away from excessive heat and provide suitable ventilation.
• Do not place the battery inside a sealed, gas-tight enclosure.
• Observe polarity during installation.
• Recycle the battery through an authorised lead-acid battery recycling facility.

All manufacturer and model names are used solely to help identify potential replacements. Brand names remain the property of their respective owners. No affiliation or endorsement is implied. Verify the latest manufacturer specifications before fitting a replacement.