12V rechargeable battery COSI CSB-1228 28Ah — sealed lead-acid (VRLA) battery for backup systems

COSI CSB-1228 is a 12V, 28Ah sealed rechargeable lead‑acid (VRLA) battery engineered for standby and backup power applications. The battery's valve‑regulated, maintenance‑free design and compact rectangular form provide predictable performance for uninterrupted power supplies, alarm panels, emergency lighting and telecom devices. Its rated capacity and stable voltage output make it suitable where reliable temporary power is required during outages or as part of standby power systems.

Advantages

The sealed VRLA construction eliminates the need for regular electrolyte checks and reduces the risk of leakage. The battery offers consistent recharge acceptance and a low self‑discharge rate for extended shelf life. Its compact dimensions and flat top terminals allow straightforward mounting in racks, enclosures or cabinets. The robust lead‑acid chemistry provides dependable standby capacity and predictable end‑of‑discharge behaviour for inverter and UPS loads.

Suitable for

• Uninterruptible power supplies (UPS) for home and small business systems
• Standalone alarm and security control panels
• Emergency and exit lighting systems
• Telecommunications equipment and small network devices
• Backup power for monitoring systems and access control

Key specifications

• Nominal voltage: 12 V
• Nominal capacity: 28 Ah (at specified discharge rate)
• Battery type: Sealed lead‑acid (VRLA), rechargeable
• Design: Valve‑regulated, maintenance‑free
• Terminal type: Flat top terminals suitable for bolt connections
• Typical applications: Standby and cyclic use in UPS, alarms, emergency lighting

How to use

Install the battery in a dry, well‑ventilated enclosure with terminals accessible for connection. Observe correct polarity when wiring to the UPS, alarm or device; connect positive to positive and negative to negative. Use appropriately rated cables and terminal bolts to ensure secure connections. Charge the battery using a compatible 12V charger or the built‑in charging circuit of the UPS according to the manufacturer's recommended charge profile for sealed lead‑acid batteries. Avoid deep discharges where possible to extend service life.

Usage recommendations

Store and operate the battery within the manufacturer's recommended temperature range; moderate room temperatures prolong service life. For standby applications, perform periodic checks of charge voltage and terminal condition and follow a controlled recharge schedule after discharge. Dispose of the battery through approved recycling channels per local regulations for lead‑acid batteries.