---
product_id: 213723954
title: "New LiftMaster 485LM Battery Backup for Garage Door Openers 3840 3850 8360 8550"
brand: "liftmaster"
price: "33349 som"
currency: KGS
in_stock: true
reviews_count: 8
category: "Lift Master"
url: https://www.desertcart.kg/products/213723954-new-liftmaster-485lm-battery-backup-for-garage-door-openers-3840
store_origin: KG
region: Kyrgyzstan
---

# Reliable power outage support 20 emergency openings backup Screw-in easy install New LiftMaster 485LM Battery Backup for Garage Door Openers 3840 3850 8360 8550

**Brand:** liftmaster
**Price:** 33349 som
**Availability:** ✅ In Stock

## Summary

> 🔋 Power your peace of mind—never get stuck in the dark again!

## Quick Answers

- **What is this?** New LiftMaster 485LM Battery Backup for Garage Door Openers 3840 3850 8360 8550 by liftmaster
- **How much does it cost?** 33349 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/213723954-new-liftmaster-485lm-battery-backup-for-garage-door-openers-3840)

## Best For

- liftmaster enthusiasts

## Why This Product

- Trusted liftmaster brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Durable:** Lightweight 3.67 lbs module with UL certification ensures safety and long-lasting performance.
- • **Silent Peace of Mind:** Eliminate annoying low battery beeps and enjoy quiet, reliable backup power.
- • **Perfect Compatibility:** Specifically engineered for LiftMaster models 3840, 3850, 8360, and 8550 for seamless fit and function.
- • **Effortless DIY Installation:** Screw-in design means no costly technician visits—replace your battery in under 10 minutes.
- • **Uninterrupted Access, Always:** Keep your garage door operational through power outages with up to 20 emergency openings.

## Overview

The LiftMaster 485LM Battery Backup is a UL-certified, screw-in replacement battery designed for select LiftMaster garage door openers. It provides up to 20 emergency openings during power outages, installs easily without professional help, and eliminates low battery warnings, ensuring reliable and silent backup power when you need it most.

## Description

The LiftMaster 485LM Battery Backup (ASIN B07Q799TCJ) is a durable, screw‑in backup battery module designed specifically for select LiftMaster garage door opener models—including 3840, 3850, 8360, and 8550—to ensure reliable operation during power outages by providing up to 20 emergency openings .

Review: Oh, What A Relief! - The constant low backup battery warning beeping from my Lift Master Model 8550W-7 with Wi-Fi has stopped! This battery is the perfect replacement for the original battery that lasted seven years. And, if you are concerned, it is very easy to replace. You do need a small ladder to reach the garage door opener and a Phillips head screw driver (I also used a pair of pliers). While standing on your ladder, unplug the unit, open the light cover (mine was on the right side of the unit as you face the garage door), unscrew the screw holding the battery compartment cover (if you drop the screw -- no worries -- it falls into the open light cover), remove the red and black wire connectors from the battery terminals (I had to use a pair of needle nose pliers to wiggle the connectors to get them off), slide the old battery out of the compartment, slip in the new battery, reconnect the wires to the red and black terminals (make sure you get the correct color wire on the same colored terminal), replace the cover with the screw, close the light cover, plug the unit back in and you are done. Took me 10 minutes at most. Best of all, the beeping did not return. On the other side of the unit, if you open the other light cover, you will see a green light -- mine was flashing which I think means that the new battery is charging. Anyway, glad I purchased the battery and did not have to pay a garage door technician to install it.
Review: Perfect fit! Easy repair! - This battery was the exact fix I needed for my garage doors. It was easy to replace and a great value! Didn’t need to call out the repair guy for emergency weekend fix! Thank you for saving me money and time!

## Features

- back up battery

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07Q799TCJ |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #37,840 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #20 in Garage Door Opener System Parts |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,206) |
| Date First Available | May 4, 2019 |
| Included Components | Battery |
| Installation Type | Screw-In |
| Item Package Quantity | 1 |
| Item Weight | 3.67 pounds |
| Item model number | 485LM |
| Manufacturer | no |
| Product Dimensions | 3 x 4 x 4 inches |
| Recommended Uses For Product | backup power for garage door openers during power outages |
| Specification Met | UL |
| UPC | 368093610583 |

## Product Details

- **Brand:** LiftMaster
- **Color:** Black
- **Exterior Finish:** Black
- **Material:** Metal
- **Product Dimensions:** 3"L x 4"W x 4"H

## Images

![New LiftMaster 485LM Battery Backup for Garage Door Openers 3840 3850 8360 8550 - Image 1](https://m.media-amazon.com/images/I/61UXV2abIgL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Oh, What A Relief!
*by G***D on September 10, 2024*

The constant low backup battery warning beeping from my Lift Master Model 8550W-7 with Wi-Fi has stopped! This battery is the perfect replacement for the original battery that lasted seven years. And, if you are concerned, it is very easy to replace. You do need a small ladder to reach the garage door opener and a Phillips head screw driver (I also used a pair of pliers). While standing on your ladder, unplug the unit, open the light cover (mine was on the right side of the unit as you face the garage door), unscrew the screw holding the battery compartment cover (if you drop the screw -- no worries -- it falls into the open light cover), remove the red and black wire connectors from the battery terminals (I had to use a pair of needle nose pliers to wiggle the connectors to get them off), slide the old battery out of the compartment, slip in the new battery, reconnect the wires to the red and black terminals (make sure you get the correct color wire on the same colored terminal), replace the cover with the screw, close the light cover, plug the unit back in and you are done. Took me 10 minutes at most. Best of all, the beeping did not return. On the other side of the unit, if you open the other light cover, you will see a green light -- mine was flashing which I think means that the new battery is charging. Anyway, glad I purchased the battery and did not have to pay a garage door technician to install it.

### ⭐⭐⭐⭐⭐ Perfect fit! Easy repair!
*by L***A on May 26, 2025*

This battery was the exact fix I needed for my garage doors. It was easy to replace and a great value! Didn’t need to call out the repair guy for emergency weekend fix! Thank you for saving me money and time!

### ⭐⭐⭐⭐⭐ Works perfect and fast delivery.
*by D***E on November 5, 2025*

Works perfect, price was good and delivery was quick.

## Frequently Bought Together

- New LiftMaster 485LM Battery Backup for Garage Door Openers 3840 3850 8360 8550
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**Shop now:** [https://www.desertcart.kg/products/213723954-new-liftmaster-485lm-battery-backup-for-garage-door-openers-3840](https://www.desertcart.kg/products/213723954-new-liftmaster-485lm-battery-backup-for-garage-door-openers-3840)

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-03-08*