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Rectangular sealed lead-acid battery cartridge, grey plastic casing, two terminal connectors

Battery Technology Inc.

Battery Technology Inc. SLA18-BTI UPS Replacement Battery

SKU CH-5X33-DKEJ6 MPN SLA18-BTI

Replacement battery cartridge compatible with APC PS250, PS250I and PS450 UPS units

  • Product typeBattery
  • Compatible withAPC UPS: PS250 PS250I PS450
  • Direct replacement for APC PS250, PS250I and PS450 UPS models
  • New sealed lead-acid cartridge restores original backup runtime
  • BTI SLA18-BTI matches OEM form factor for tool-free installation
  • Manufacturer-listed January 17 2025 ensures current production stock
  • Single-battery cartridge simplifies maintenance for small UPS units

Direct replacement for APC UPS models

The BTI SLA18-BTI is a new UPS replacement battery cartridge designed for APC PS250, PS250I and PS450 units. It restores backup runtime when the original cells reach end of life. Home-office users and small-business operators can swap the cartridge without tools or specialised training.

Sealed lead-acid chemistry limits

The battery uses sealed lead-acid technology, which delivers reliable standby power but loses capacity gradually over several years. Runtime shortens as the cells age, and deep discharges accelerate wear. The cartridge fits only the three listed APC models; it cannot be used in larger UPS units or other brands.

Replaces exhausted RBC18 cartridges

This cartridge replaces an APC RBC18 when the UPS signals a battery fault or runtime falls below useful levels. The jump is worth it when the existing pack no longer holds enough charge for a safe shutdown. Buyers needing longer runtime than the original specification or compatibility with other UPS models should look elsewhere.

How it compares

Measured against everything we stock in UPS Replacement Batteries, at today’s prices. Recalculated every night.

Price $54.99
Pricier than about 63% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Brand nameBTI
Model nameSLA18-BTI
Product typeBattery
Size & build
Shipping weight3.63 kg
Package size508 × 254 × 127 mm
Compatibility
Compatible withAPC UPS:
PS250
PS250I
PS450

Questions about this item

Which BTI SLA18-BTI version fits my APC UPS?

The SLA18-BTI cartridge replaces the RBC18 pack in APC PS250, PS250I and PS450 models.

What runtime can I expect once the SLA18-BTI is installed?

Runtime depends on the connected load; the pack restores the original capacity designed for PS250, PS250I and PS450 units.

Does the SLA18-BTI use a standard connector that plugs straight in?

Yes, it matches the APC RBC18 form factor and connector for direct installation in compatible UPS models.

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