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Lenovo ThinkPad T420s T420si Battery 66+

Lenovo ThinkPad T420s, T420si Battery 0A36287 42T4844 42T4845   66+

List Price: $153.99
Our Price: $68.90

Availability: Usually Ships in 6 to 8 Weeks
Product Code:


Lenovo ThinkPad T420s and T420si Type 66+

Get longer battery life and improved laptop performance with a new Lenovo ThinkPad T420s and T420si laptop battery.

This battery is made with the highest quality lithium-ion cells that charge faster and last longer than cheaper, lower quality batteries. Li-ion battery technology provides longer run times with less weight. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. This ThinkPad T420s battery is 100% compatible with the original battery specifications and is individually tested and backed by a 2 Year warranty.

Tech Specs

  • Xtend brand
  • 11.1 Volts - also compatible with 10.8 Volt systems
  • 3600 mAh 44Wh
  • 6 Cell Li-ion
  • Samsung (South Korea)
  • Black
  • Assembled in China
  • 2 Year Warranty
  • 30 day full satisfaction guarantee
  • 300-500 recharge cycles

THIS BATTERY ONLY WORKS WITH THE Lenovo T420s AND T420si. This battery will not work in the T430s or T430 models.

You can expect about 5 hours to 5-1/2 hours of run time with this T420s battery when new, depending on your energy use. If you are looking for even longer battery run times, check out our extended run battery for your Lenovo laptop.

Replaces these Lenovo ThinkPad battery part numbers:


Compatible Laptop Chargers:
AC Adapter For Lenovo 20 V 4.5A 90 W 7.7Mm-5.5Mm Pin Inside Connector
Our Price: $52.00

AC adapter for Lenovo Laptops 20V-4.5A 90 watts 7.7mm-5.5mm Pin Inside connector

Compatible with the following models:

Lenovo Batteries > ThinkPad T Series > ThinkPad T420s
Lenovo Batteries > ThinkPad T Series > ThinkPad T420siŠ
IBM Laptop Batteries > ThinkPad T420s
IBM Laptop Batteries > ThinkPad T420siá