Keep your essential electronic equipment powered during unexpected electricity interruptions with the LIGHTWAVE UPS BATTERY 12V 18AH (LW18AH). This rechargeable battery is designed to provide dependable backup energy for compatible Uninterruptible Power Supply (UPS) systems, inverters, security installations and other standby power applications.
With a nominal voltage of 12V DC and a capacity of 18Ah, the Lightwave LW18AH offers a higher energy-storage capacity than conventional 7Ah and 9Ah UPS batteries. This makes it a suitable option for compatible systems that require extended backup runtime.
The battery uses Sealed Maintenance-Free (SMF) Valve Regulated Lead Acid (VRLA) technology with AGM construction. Its sealed design eliminates routine water refilling and helps prevent electrolyte leakage under normal operating conditions. As a result, it is convenient for home, office and commercial installations.
Key Features and Benefits
- 12V DC Nominal Voltage: Designed for compatible 12V backup power systems.
- 18Ah Capacity: Provides substantial stored energy for compatible UPS and standby applications.
- VRLA AGM Technology: Uses sealed lead-acid technology with an absorbent glass mat separator.
- Maintenance-Free Construction: No regular water topping-up is required.
- M5 Bolt-and-Nut Terminals: Provides secure electrical connections for compatible battery cables.
- Compact Design: Approximately 181 × 76 × 168mm, making it suitable for many UPS and backup battery compartments.
- Durable Housing: Designed for dependable everyday standby applications.
- Rechargeable Performance: Supports compatible cyclic and standby charging.
- Low Internal Resistance: Approximately 15mΩ when fully charged at 25°C.
- Multiple Applications: Suitable for UPS systems, CCTV, alarm systems, emergency lighting and other compatible backup equipment.
Extended Backup Capacity for Your Equipment
The Lightwave 18Ah battery is designed for applications that need more stored energy than smaller UPS batteries can provide. Its 18Ah capacity makes it useful for compatible UPS installations in offices, businesses, computer rooms and security systems.
Actual backup time depends on the connected load, battery condition, UPS efficiency, discharge rate and the number of batteries installed in the system.
The official battery specification provides the following capacity ratings at 25°C:
- 20-hour discharge rate: 18Ah at 0.9A.
- 10-hour discharge rate: 17.1Ah at 1.62A.
- 5-hour discharge rate: 15.3Ah at 3.06A.
- 3-hour discharge rate: 13.5Ah at 4.5A.
- 1-hour discharge rate: 10.8Ah at 10.8A.
These figures demonstrate why the rated 18Ah capacity should not be interpreted as the same available capacity at every discharge rate.
Sealed Maintenance-Free AGM Technology
The LIGHTWAVE LW18AH uses Valve Regulated Lead Acid technology with an AGM construction. The electrolyte is absorbed within a glass mat separator, supporting a sealed battery design suitable for standby power installations.
Unlike conventional flooded lead-acid batteries, this design does not require routine water refilling. Its sealed construction also helps minimise electrolyte leakage during normal use when installed and operated according to the manufacturer’s instructions.
This makes the battery practical for installations where reliable backup power and reduced maintenance requirements are important.
Charging Performance and Battery Management
The Lightwave 12V 18Ah battery supports both cyclic charging and standby or float charging.
Recommended charging parameters at 25°C include:
- Cycle Charging Voltage: 14.4V–15.0V DC.
- Standby/Float Charging Voltage: 13.5V–13.8V DC.
- Maximum Initial Charging Current: Less than 3.6A for cyclic charging.
- Temperature Compensation – Cycle Charging: -30mV/°C.
- Temperature Compensation – Standby Charging: -20mV/°C.
Use a compatible charger or UPS charging circuit. Avoid excessive charging voltage and deep discharge to help maintain battery performance and service life.
Physical Design and Installation
The LW18AH has a compact rectangular casing designed for compatible UPS and backup power installations.
Its M5 bolt-and-nut terminal arrangement provides a secure connection when the correct cable lugs and terminal hardware are used. Before replacing an existing battery, check the voltage, capacity, dimensions, terminal arrangement and polarity.
Do not assume that every UPS designed for a 12V battery can automatically accept an 18Ah replacement. Confirm the manufacturer’s battery compatibility requirements first.
Recommended Applications
The LIGHTWAVE 12V 18AH UPS Battery can be used in compatible:
- UPS systems for computers and office equipment.
- CCTV surveillance and security installations.
- Alarm and access-control systems.
- Emergency lighting systems.
- Telecommunications and networking backup systems.
- Compatible inverter and standby power installations.
- Medical mobility and other approved backup applications.
Detailed Product Specifications
- Brand: LIGHTWAVE
- Model: LW12V/18AH / LW18AH
- Product Type: Rechargeable UPS Battery
- Nominal Voltage: 12V DC
- Nominal Capacity: 18Ah
- Capacity Rating: 20-hour rate
- Battery Chemistry: Sealed Lead Acid (SLA)
- Battery Technology: VRLA AGM
- Construction: Sealed Maintenance-Free (SMF)
- Internal Resistance: Approximately 15mΩ at full charge and 25°C
- Terminal Type: Bolt-and-nut terminal
- Terminal Bolt Size: M5
- Length: 181 ± 1mm
- Width: 76 ± 1mm
- Container Height: 168 ± 1mm
- Total Height: 168 ± 1mm
- Weight: Approximately 5.05kg ± 5%
- Cycle Charging Voltage: 14.4V–15.0V at 25°C
- Standby Charging Voltage: 13.5V–13.8V at 25°C
- Maximum Initial Cycle Charging Current: Less than 3.6A
- Capacity at 40°C: Approximately 102%
- Capacity at 25°C: Approximately 100%
- Capacity at 0°C: Approximately 85%
- Primary Applications: UPS systems, security systems, emergency lighting and compatible standby power installations.
Why Choose the LIGHTWAVE 12V 18AH UPS Battery?
When your equipment requires dependable backup power, choosing a battery with the correct voltage and capacity is essential. The LIGHTWAVE LW18AH combines an 18Ah capacity, sealed maintenance-free construction and secure M5 bolt terminals in a compact design.
It is a practical replacement option for compatible UPS systems and other standby applications in homes, offices and businesses.
Choose the LIGHTWAVE UPS BATTERY 12V 18AH for reliable stored power and convenient maintenance-free operation.








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