Can I use this TIANWEI 12V 12Ah battery to replace a 12V 7Ah or 9Ah battery in my UPS?

You can only upgrade to the TIANWEI 12V 12Ah Sealed Lead Acid Battery if your UPS enclosure has enough physical space, as 12Ah batteries are significantly larger (15x9.8x10cm) than standard 7Ah/9Ah batteries. If it fits physically, the 12V voltage matches perfectly, and the higher 12Ah capacity will simply provide a much longer backup runtime during a power outage.

Is a Sealed Lead Acid (SLA) battery better than a lithium battery for a UPS?

For standard UPS applications, the TIANWEI 12V 12Ah SLA Battery is generally better and safer than a lithium battery. UPS charging circuits are specifically calibrated to float-charge lead-acid batteries at 13.5V-13.8V. Dropping a lithium battery into an older UPS without a compatible Battery Management System (BMS) can lead to overcharging and severe fire hazards.

How should I charge this TIANWEI 12V 12Ah battery for the first time?

The TIANWEI 12V 12Ah Sealed Lead Acid Battery comes partially charged from the factory, but you should charge it fully before its first heavy use. If you are installing it in a UPS or alarm system, simply connect the terminals and turn the system on; the built-in charger will automatically condition the battery.

Can I connect two of these 12V 12Ah batteries together to get 24V?

Yes, you can connect two TIANWEI 12V 12Ah batteries in series to create a 24V 12Ah system, which is common in larger UPS units or electric scooters. If you connect them in parallel, you will get a 12V 24Ah system for extended runtime. Always use identical, brand-new batteries when wiring them together.

Is it safe to mount this non-spillable battery on its side or upside down?

You can safely mount it on its side, but upside-down (inverted) installation is strictly prohibited. The TIANWEI 12V 12Ah SLA Battery features a VRLA non-spillable design with AGM mats that suspend the acid, preventing leaks when placed sideways. However, mounting it upside down interferes with the safety pressure relief valves and can cause permanent damage.

TIANWEI 12V 12Ah SLA Battery

Name: TIANWEI 12V 12Ah SLA Battery | UPS Replacement
Brand: Tianwei
SKU: 21BY000331
Price: 179.0 HKD
Availability: InStock

Short Product Description

Is your office UPS beeping or failing to hold a charge? The TIANWEI 12V 12Ah Sealed Lead Acid (SLA) Battery is the perfect heavy-duty replacement to keep your critical systems running during power outages. Featuring a non-spillable, maintenance-free design (Model: 6-FM-12), it delivers reliable standby power for Uninterruptible Power Supplies (UPS), CCTV DVRs, and alarm systems. Weighing a solid 2463g, this high-capacity battery ensures long-lasting durability. Need to replace a dead server battery urgently?新昌電腦有限公司 (Sun Cheong Computer Co. Ltd.)has over 20 years of hardware expertise. Visit our Sham Shui Po physical store for instant pickup and safe battery disposal advice!

Key Features

High 12Ah Capacity: Provides extended runtime for UPS systems, ensuring you have ample time to save your work and shut down servers safely during a blackout.
Non-Spillable Casing: The completely sealed, maintenance-free design prevents acid leaks, allowing for safe installation in tight or enclosed spaces.
Broad Compatibility: The standard 15cm x 9.8cm x 10cm footprint makes it a drop-in replacement for most 12V 12Ah applications, including electric scooters and alarm panels.
Dual Application Ready: Engineered to perform exceptionally well in both standby use (UPS/CCTV) and cyclic use (solar storage/mobility devices).
Low Self-Discharge Rate: Retains its charge effectively during storage, ensuring the battery is ready to perform when an emergency strikes.
Instant Store Pickup: Don't wait for shipping when your security system is offline; grab a heavy-duty replacement instantly at our Sham Shui Po retail location.

Full Product Description

Reliable Backup Power for Critical Systems

The TIANWEI 12V 12Ah Sealed Lead Acid Battery ensures your critical electronics stay powered during unexpected outages and voltage drops. When a power grid fails, a reliable Uninterruptible Power Supply (UPS) is the only thing standing between your data and a total system crash. This high-capacity 12Ah battery is engineered to deliver a steady, long-lasting current, making it an essential replacement component for office servers, home security systems, and emergency lighting setups.

Non-Spillable & Maintenance-Free Design

Designed with a fully sealed, non-spillable casing, the TIANWEI 12V 12Ah SLA Battery requires zero maintenance and can be safely installed upright or on its side. Unlike traditional flooded batteries that require regular water top-ups and careful handling, this Valve Regulated Lead Acid (VRLA) battery traps escaping gases and recombines them internally. This makes it completely safe for indoor use inside enclosed UPS chassis or custom DIY solar power boxes. (Note: Upside-down installation is strictly prohibited to ensure proper safety valve operation).

💡 Pro Tip from Our Technicians

"When your UPS starts emitting a continuous beeping sound, 90% of the time the machine isn't broken—the internal lead-acid battery has simply reached the end of its lifespan! Before installing this TIANWEI 12V 12Ah Battery, always check your equipment's charging circuit. For standby use (like in a UPS), the charging voltage should be between 13.5V and 13.8V. If you are using it for cyclic applications (like an electric scooter), it requires 14.4V to 15.0V. Never let an SLA battery drain completely to 0%, as deep discharging causes permanent sulfation. Need help verifying your UPS voltage? Bring your unit to our Sham Shui Po store! Our team at 新昌電腦有限公司 (Sun Cheong Computer Co. Ltd.) can help you test your UPS and find the exact replacement battery."

Technical Specifications

Brand: TIANWEI
Model: 6-FM-12
Battery Chemistry: Sealed Lead Acid (SLA) / VRLA
Nominal Voltage: 12V
Capacity: 12Ah (20HR)
Cycle Use Voltage: 14.4V - 15.0V
Standby Use Voltage: 13.5V - 13.8V
Initial Current: Less than 3.0A
Dimensions (L x W x H): 15cm x 9.8cm x 10cm
Weight: 2463g
Safety Certifications: CE, Pb (Lead recycling compliant)

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

Can I use this TIANWEI 12V 12Ah battery to replace a 12V 7Ah or 9Ah battery in my UPS?You can only upgrade to the TIANWEI 12V 12Ah Sealed Lead Acid Battery if your UPS enclosure has enough physical space, as 12Ah batteries are significantly larger (15x9.8x10cm) than standard 7Ah/9Ah batteries. If it fits physically, the 12V voltage matches perfectly, and the higher 12Ah capacity will simply provide a much longer backup runtime during a power outage.
Is a Sealed Lead Acid (SLA) battery better than a lithium battery for a UPS?For standard UPS applications, the TIANWEI 12V 12Ah SLA Battery is generally better and safer than a lithium battery. UPS charging circuits are specifically calibrated to float-charge lead-acid batteries at 13.5V-13.8V. Dropping a lithium battery into an older UPS without a compatible Battery Management System (BMS) can lead to overcharging and severe fire hazards.
How should I charge this TIANWEI 12V 12Ah battery for the first time?The TIANWEI 12V 12Ah Sealed Lead Acid Battery comes partially charged from the factory, but you should charge it fully before its first heavy use. If you are installing it in a UPS or alarm system, simply connect the terminals and turn the system on; the built-in charger will automatically condition the battery.
Can I connect two of these 12V 12Ah batteries together to get 24V?Yes, you can connect two TIANWEI 12V 12Ah batteries in series to create a 24V 12Ah system, which is common in larger UPS units or electric scooters. If you connect them in parallel, you will get a 12V 24Ah system for extended runtime. Always use identical, brand-new batteries when wiring them together.
Is it safe to mount this non-spillable battery on its side or upside down?You can safely mount it on its side, but upside-down (inverted) installation is strictly prohibited. The TIANWEI 12V 12Ah SLA Battery features a VRLA non-spillable design with AGM mats that suspend the acid, preventing leaks when placed sideways. However, mounting it upside down interferes with the safety pressure relief valves and can cause permanent damage.

Target Users / Applications

SME IT Administrators: Replacing dead internal batteries in rack-mounted or tower UPS systems to protect office servers from sudden power failures.
Village House Owners: Providing reliable 12V backup power for outdoor CCTV DVR cabinets and home alarm panels during rural power grid fluctuations.
Mobility & Hobbyist Users: Powering electric wheelchairs, mobility scooters, or DIY solar-powered lighting setups that require deep-cycle 12Ah capacity.

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TIANWEI 12V 12Ah Sealed Lead Acid Battery | UPS & CCTV Backup