Craftsman Garage door opener Battery

Replacing your Garage Door Battery

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By Bruce W. Smith

Garage doors with backup batteries are a common site in homes across the country where storms bring frequent power outages.

But the backup battery doesn’t live forever, despite the built-in battery charging systems found in many of the better systems. Long periods without power, or frequent periods of using the standby battery pack before power is restored, eventually takes a toll.

Fortunately, there’s an easy solution: Replace the batteries inside the backup pack. The fix takes less than 20 minutes and costs less than $30.

The batteries in my Sears Diehard garage door opener backup battery system is the same as those found in thousands of others—a pair of 12V / 5Ah units that are common in home security systems’ backup batteries.

I found the replacement batteries at eComElectronics.com for $30/pair with free shipping—or about 1/3 the price of Sears replacement batteries. (The same battery fits a host of other brand’s garage door backup systems, including Liftmaster and Chamberlain.)

02_BS21141Replacement requires nothing more than removing the four screws that hold the top of the backup battery pack in place, disconnecting each battery’s wire from the circuit board, crimping on spade connectors to the new batteries’ leads, and dropping them in place of the old batteries.

Now if the power goes out, push the garage door control and … open sesame.

This Sears Diehard garage door opener battery backup lasted for 8 years before the internal batteries died.

The plastic top is held in place by four self-threading screws that are easily removed.

The backup battery system consists of two 5Ah rechargeable batteries (Sears #41B822) that plug into the smart circuitry. To remove, unplug the connecting wires from the circuit board.

This UB1250 battery (eCom #4228) is the direct replacement for the Sears 41B822. Street price is about $15.

New batteries come with universal 18-ga. spade terminals. So the wires have to be cut from the old batteries and fitted with spade connectors.

Reinstall the new batteries and plug the connector wires back into the control board.

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New batteries are in place. You may have to bend the terminal at the “top” of each battery so it clears the edges. (Original battery wires were built into the battery itself.)

Replace the top. In some instances a little minor trimming on the underside of the top is needed to clear the upper spade terminal on each battery.

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Mighty Max Battery ML5-12 - 12V 5AH Battery for Craftsman Garage door opener model 53918 - Mighty Max Battery brand product
CE (Mighty Max Battery)
  • ML5-12 SLA is a 12V 5AH Sealed Lead Acid (SLA) rechargeable maintenance free battery
  • Dimensions: 3.54 inches x 2.76 inches x 4.21 inches. Terminal: F1. Listing is for the Battery only. No wire harness or mounting accessories included.
  • SLA / AGM spill proof battery has a characteristic of high discharge rate, wide operating temperatures, long service life and deep discharge recover.
  • Rechargeable battery that can be mounted in any position, resists shocks and vibration. Long lasting high performance in high and low temperatures
  • Backed by a 30 day refund policy and full 1 year warranty
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BatteryJack inc. 12V 5AH Battery for Craftsman Garage door opener model 53918 3 Year Warranty
CE (BatteryJack inc.)
  • PowerStar® Brand Batteries
  • 3 Year Warranty When Used In FLOAT DEVICES and 2 YEAR WARRANTY IN ALL OTHER DEVICES
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  • Stable Quality & High Reliability
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Chamberlain Chamberlain 4228 Replacement Battery for Garage Access Systems
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  • Operates the garage door opener as if the power was still on (all safety and security features still operate)
  • For use with all Chamberlain Garage Door Openers with a Battery Backup System
  • 12 Volt
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Craftsman Craftsman 3/4 HP DC Belt Drive Garage Door Opener with DieHard Battery Back-Up
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  • General Warranty:10 years motor, 90 day parts/labor
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  • Safety Sensor Type:Non-contact
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