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CMOS Battery for Dell Latitude E5440 E5450 E6440 E6420 E7440 E7240,CMOS… competes with other Tools & Maintenance products on SpecPicks. Use our Compare tool to view specs side-by-side, or browse the full Tools & Maintenance category for alternatives.

LJCELL

CMOS Battery for Dell Latitude E5440 E5450 E6440 E6420 E7440 E7240,CMOS battery for Dell AlienWare M11x R1 R2 Area-51 M9700 M9750 laptop BIOS RTC CR2032 Battery with 2 Wire Cable and connector.

Name: CMOS Battery for Dell Latitude E5440 E5450 E6440 E6420 E7440 E7240,CMOS battery for Dell AlienWare M11x R1 R2 Area-51 M9700 M9750 laptop BIOS RTC
Brand: LJCELL
SKU: B0BYK52CSF
Price: 7.39 USD
Availability: InStock

By Mike Perry, Hardware Editor · Verified 2026-09-06

Mike Perry has researched PC hardware since 2014, tracking 80+ GPU generations, 50+ retro handheld platforms, and 30+ vintage PC configurations. He synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. View full credentials →

$7.39

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*Price sourced from Amazon.com. Last updated 2026-04-19. Price and availability subject to change.

Bottom line: The CMOS Battery for Dell Latitude E5440 E5450 E6440 E6420 E7440 E7240,CMOS battery for Dell AlienWare M11x R1 R2 Area-51 M9700 M9750 laptop BIOS RTC CR2032 Battery with 2 Wire Cable and connector. is a niche pick — read recent reviews before buying in the tools & maintenance category, priced around $7.39. Compare close alternatives before committing.

SpecPicks Verdict

SpecPicks scored CMOS Battery for Dell Latitude E5440 E5450 E6440 E6420 E7440… using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the tools & maintenance category. LJCELL's tools & maintenance lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Mixed or limited buyer feedback at this price point — focus your evaluation on recent reviews that specifically address build quality and long-term reliability, and shortlist one or two close alternatives before deciding.

Common buyer scenarios for tools & maintenance: PC towers accumulate significant dust in 3–6 months, so cleaning frequency drives cordless vs. canned-air tradeoff decisions. Match the device's RPM or CFM rating to your case size, and confirm battery runtime covers a full tower cleaning before ordering. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Pros & Cons

Pros

✓ Backed by LJCELL's warranty and support channels
✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ Check battery runtime and RPM/CFM specs match your case size and cleaning frequency
✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

Key Features

High-quality Cmos Battery: This CR2032 battery is specifically designed for laptops and has high-quality performance and reliability, so you can say goodbye to laptop time and date setting issues!
Compatibility: This battery is universal and compatible with most laptop brands and models, which means you only need to buy one battery to use on multiple laptops.Rtc Bios Cmos battery compatible with Dell Alienware M11x R1 R2 Area-51 13 15 17 18 R2 R3 R4 M14x R1 R2 M17x M18x R2 Area-51 M9700 M9750;Cmos battery for Dell Precision M6600 M4600 M4700 M6700 M4800 M6800 M3800 15 (7510);Cmos battery for Dell Inspiron 15 (7559), 15 (7577), 9400, 9300, 9200;Cmos battery for Chromebook 13 (7310);Cmos battery for Dell XPS 1820.
Longevity: This battery has a long lifespan and can keep your laptop's time and date setting for up to 8 years, which means you don't need to replace the battery frequently and can save a lot of time and money.
Convenient and easy to use: The product size is 20mm (0.79 inches) in diameter, about 3.5mm (0.138 inches) in height, and 65mm (2.56 inches) in length.Replacing the battery is very simple and can be completed in just a few steps without any special professional skills or tools, which means you can easily complete the battery replacement task on your own.
Battery packaging: Each battery product is individually packaged, these batteries cannot be charged, otherwise they will damage the battery and product.

Full Specifications

Brand	LJCELL
Voltage	3 volts
Model Name	LJ-CMOS-4
Unit Count	1 Count
Reusability	Single Use
Model Number	LJ-CMOS-4
Battery Weight	3 g
Item Dimensions	3.35 x 0.79 x 0.08 inches
Antenna Location	Laptop
Battery Capacity	240 milliamp_hours
Battery Cell Type	Lithium Manganese Dioxide
Battery packaging	Each battery product is individually packaged, these batteries cannot be charged, otherwise they will damage the battery and product.
Number of Batteries	1 CR2032 batteries required. (included)
Warranty Description	8 years validity
Battery Cell Composition	Lithium Manganese Dioxide
Recommended Uses For Product	Laptop

Ready to buy?

CMOS Battery for Dell Latitude E5440 E5450 E6440 E6420 E7440 E7240,CMOS battery for Dell AlienWare M11x R1 R2 Area-51 M9700 M9750 laptop BIOS RTC CR2032 Battery with 2 Wire Cable and connector. is sold on the used and vintage market, where eBay carries the live inventory — Amazon does not stock this part. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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*Price sourced from Amazon.com. Last updated 2026-04-19. Price and availability subject to change.