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Two black rectangular 12V 40Ah lead acid batteries side by side

PowerWarehouse

PowerWarehouse 2XRBC4SLA40 UPS Replacement Battery 12V 40Ah 2 Pack

SKU CH-ZPPS-Y4M32

Two 12V 40Ah lead-acid batteries replace cartridge #4 in APC Back-UPS BK650MC units

  • Compatible withFits: APC Back UPS BK650MC
  • Fits APC Back-UPS BK650MC for direct replacement
  • 12 V 40 Ah lead-acid cells deliver rated capacity
  • Two-battery pack restores full runtime in one step
  • 100 % compatibility guaranteed by manufacturer testing

Replacement Battery for APC BK650MC

This two-pack supplies 12V 40Ah sealed lead-acid cells built to fit the APC Back-UPS BK650MC. Each cartridge matches the original equipment specifications so the UPS recognises the batteries without extra configuration. The pair restores runtime for home-office or small-business backup scenarios.

Thermals Noise and Power Draw

Sealed lead-acid chemistry runs passively with no fan, so operation is silent in normal use. Self-discharge is low, meaning the pack holds charge during extended mains periods without drawing extra power. Heat output stays minimal inside the UPS enclosure under typical load cycles.

How it compares

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

Price $71.99
Pricier than about 71% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Brand namePowerWarehouse
Model name2XRBC4SLA40
Compatibility
Compatible withFits: APC Back UPS BK650MC

Questions about this item

How do I install the two 12V 40Ah batteries in the APC Back UPS BK650MC cartridge?

Open the battery door, unplug the old cartridge, slide the new PowerWarehouse cartridge in until it clicks, then close the door and let the UPS charge for several hours.

When should I replace these lead-acid batteries again?

Expect roughly three to five years of service; replace when runtime drops below 100 minutes or the UPS shows a battery-fault indicator.

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