Fancy Buying L13L4A01 Laptop Battery for Lenovo B40/B50

Fancy Buying L13L4A01 is a 14.8V, 2200mAh (33Wh) six-cell lithium-ion replacement battery engineered for Lenovo B40/B50 and IdeaPad N40/N50 family laptops.

This high-density battery is designed to bring a reliable power source back to older Lenovo notebooks without modifying the original hardware. It matches multiple Lenovo part numbers and OEM form factors while including built-in protection circuits for overcharge, overdischarge, short-circuit and temperature control. The cell arrangement and rated capacity provide steady runtime for general productivity and web tasks, and the pack is manufactured to meet common OEM safety standards.

Which Lenovo models does this battery fit?

The Fancy Buying L13L4A01 battery is compatible with a wide range of Lenovo consumer and business laptops. It supports both the B-series and IdeaPad N-series machines, including touch variants and several branded submodels.

• Fits: B40-30, B40-45, B40-70, B50-30, B50-45, B50-70.
• Also fits IdeaPad: N40-30, N40-45, N40-70, N50-30, N50-45, N50-70.
• Compatible with model lines: M4400, M4450, V4400 and related A variants.
• Cross-reference part numbers provided for exact-match verification.

How safe and durable is this replacement battery?

This battery includes standard protection circuits and quality-controlled assembly to reduce the risk of charging faults. The pack is built with overcurrent, overcharge, overdischarge and temperature safeguards and is rated for hundreds of recharge cycles under normal use.

• Protection: overcharge, overdischarge, short-circuit, and thermal management.
• Construction: 6-cell Li-ion pack with stable voltage output at 14.8V.
• Lifetime: designed for up to roughly 500 charge cycles depending on use and care.
• Manufacturing: 100% new cells and circuit boards, tested to OEM-style standards.

What performance can I expect from a 2200mAh 33Wh pack?

A 33Wh capacity offers moderate runtime suited to light-to-moderate workflows like word processing, web browsing and video streaming. Actual runtime depends on your specific laptop configuration, screen brightness, wireless usage and running applications.

• Typical use: several hours for basic productivity tasks at moderate brightness.
• Heavy use: shorter runtime when running demanding software or high brightness.
• Charging: supports fast, stable charges while protection circuitry prevents harmful conditions.
• Voltage: 14.8V matches OEM specifications for stable performance.

How do I confirm compatibility before ordering?

Verify your laptop’s existing battery part number or the service tag/model printed on the underside of the notebook. Cross-check the provided replacement numbers to be certain of a fit, and use the seller’s search method if unsure.

• Check existing battery label for part numbers such as L13L4A01, L12S4E55, 45N1182, etc.
• Compare model numbers: B40, B50, N40, N50, M4400, M4450, V4400 series.
• Use the retailer’s compatibility tool or contact support with your laptop model and serial.
• When in doubt, consult the seller within 24 hours for confirmation before purchase.

Who is this for? This Fancy Buying replacement battery is suited for owners of older Lenovo B40/B50 or IdeaPad N40/N50 series laptops who need a cost-effective, OEM-form-factor swap to restore mobile use. It's ideal for students, home users and small-business owners who require dependable daily runtime without upgrading the entire notebook. If you need exact-match compatibility for specific part numbers or want a backup pack for travel, this battery provides a practical option backed by a 30-day refund and 12-month warranty.