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Rectangular lead-acid UPS battery cartridge, 12 V 3500 mAh

Battery Technology Inc.

Battery Technology Inc. SLA35-BTI 3500 mAh 12 V DC ups replacement battery

SKU CH-TA73-QJKGQ MPN SLA35-BTI

Lead-acid UPS cartridge rated 3500 mAh at 12 V DC, compatible with APC BE425M and BE425M-LM models

  • TypeBattery
  • 3500 mAh capacity powers APC BE425M UPS units longer
  • 12 V DC lead-acid chemistry matches original specifications
  • 18-month limited warranty protects your investment
  • Direct replacement for APC BE425M and BE425M-LM models
  • New BTI cartridge installs without modification

BTI 3500 mAh 12 V Lead-Acid UPS Battery

The Battery Technology Inc. SLA35-BTI is a sealed lead-acid replacement cartridge rated at 3500 mAh and 12 V DC. It is designed to restore runtime to compatible APC uninterruptible power supply units. The part number RBC35SLA35BTI identifies the exact fit for supported models. Buyers needing a different voltage, chemistry or capacity must select another product.

Passive Thermal Behaviour and Power Profile

Sealed lead-acid cells operate without fans, so the cartridge adds no audible noise to the UPS. Heat generated during charge or discharge is dissipated through the plastic case into the host enclosure. The 12 V output matches the original specification, drawing only the current the UPS requests. Units requiring active cooling or higher voltage rails are not served by this design.

Direct Drop-In Compatibility

The cartridge is listed as compatible with APC BE425M and BE425M-LM models, allowing tool-less swap in those chassis. An 18-month limited warranty from the manufacturer covers the replacement. No additional cables, mounting brackets or configuration software are bundled. Installations in other UPS brands or form factors are not supported by this part.

Highlights

  • 3500 mAh capacity powers APC BE425M UPS units longer
  • 12 V DC lead-acid chemistry matches original specifications
  • 18-month limited warranty protects your investment
  • Direct replacement for APC BE425M and BE425M-LM models
  • New BTI cartridge installs without modification

Specifications

BrandBTI
TypeBattery
Shipping weight1.43 kg
Package size229 × 178 × 102 mm

Questions about this item

How do I install the BTI SLA35-BTI cartridge in my APC BE425M and what step is often missed?

Power off the UPS, open the battery door, disconnect the old leads noting polarity, connect the new cartridge red-to-red and black-to-black, close the door, then turn the UPS on and let it charge for at least eight hours before relying on backup runtime.

What maintenance or replacement will the lead-acid cartridge need later?

Expect to replace the cartridge every three to five years; keep the UPS plugged in so the battery stays topped up, avoid deep discharges, and recycle the old unit through a local hazardous-waste programme when capacity drops below useful runtime.

What limit appears first during a long outage with the 3500 mAh 12 V DC pack?

The 3500 mAh capacity sets the runtime ceiling; once the stored charge is depleted the UPS shuts down, so plan loads that the pack can support for the duration you need.

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