Lenovo 45N1140 Original Battery 46Wh 14.8V for ThinkPad S3 S431, S440, V4400U

The Lenovo 45N1140 battery price in BD at QASWATEC covers an original 46Wh, 14.8V Li-ion pack for the Lenovo ThinkPad S3 S431, ThinkPad S440 and ThinkPad V4400U laptops. If your ThinkPad shuts down soon after unplugging, a new 45N1140 restores its cordless runtime. The pack is black, new and tested before sale, with warranty from QASWATEC.

Key Features

• Battery type: Li-ion, new condition
• Capacity: 46Wh
• Voltage: 14.8V
• Original grade Lenovo 45N1140 pack
• Fits ThinkPad S3 S431
• Fits ThinkPad S440 and V4400U

Compatible Laptops and Part Numbers

This battery is listed for the Lenovo ThinkPad S3 S431, ThinkPad S440 and ThinkPad V4400U series. It replaces the codes 45N1141, 45N1138, 45N1139 and 121500159. Check the label on your old battery before ordering, and send us a photo if you are unsure about your exact model.

Signs the Battery Needs Replacing

• The laptop shuts down soon after unplugging
• Battery time has dropped sharply
• The charge percentage will not rise
• The pack swells or the base lifts

Why Replace It Early

A tired pack leaves a work laptop tied to a socket, and a swelling one can press on the trackpad or crack the case. Replacing it early keeps the laptop safe and portable.

What You Get

You receive a new 45N1140 battery pack with warranty from QASWATEC. Our team can check the fit for you before you buy, so you avoid a wrong order and a second trip to the shop.

Care Tips for Longer Life

• Avoid draining the pack to zero often
• Keep the vents clear of dust
• Do not leave it at 100 percent for days

A cooler pack ages slowly, which slows capacity loss.

Before You Order

Match the part number and your laptop model. Send a photo of the label if you are unsure.

Buy Lenovo 45N1140 Battery from QASWATEC

QASWATEC has served laptop users from Elephant Road, Dhaka since 2010. Visit the showroom to collect your battery, or order and we will deliver across Bangladesh.