Lenovo L21C4P73 Original Battery 49.5Wh 7.7V for ThinkPad X13s Gen 1

The Lenovo L21C4P73 battery price in BD at QASWATEC covers an original 49.5Wh, 7.7V Li-ion pack for the Lenovo ThinkPad X13s Gen 1 laptop. If your ThinkPad shuts down soon after unplugging, a new L21C4P73 restores its cordless runtime. The pack is black, new, A grade and tested before sale, with warranty from QASWATEC.

Key Features

• Battery type: Li-ion, new condition
• Capacity: 49.5Wh
• Voltage: 7.7V
• Original grade Lenovo L21C4P73 pack
• Fits ThinkPad X13s Gen 1
• Matches SB10W51979 and 5B10W51878

Compatible Laptops and Part Numbers

This battery is listed for the Lenovo ThinkPad X13s Gen 1 series. It replaces the battery part numbers SB10W51979, L21L4P76, L21M4P76, 5B10W51878, L21C4P73 and L21M4P73. 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 thin business 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 L21C4P73 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 L21C4P73 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.