The above-mentioned item is a high-quality, compatible battery for your ThinkPad T420 4180-ED3. It is an excellent replacement battery for your existing or defective ThinkPad T420 4180-ED3. It can also serve as an additional spare battery for on-the-go use. Handling and charging are as usual, seamlessly done with the standard power supply or charger. A high level of safety is provided by the protection electronics against overcharging and short circuits. The use of high-quality cells allows for a higher number of charge-discharge cycles, resulting in a longer lifespan for your new ThinkPad T420 4180-ED3 battery. Quality is our top priority. This means all batteries are new and unused. Our own quality assurance ensures a high standard of quality. Note: Unless we explicitly state that this is an original product, we supply a compatible product. This means it is by no means an original product from the manufacturer and is therefore not produced or recommended by them. All brand and product names are the property of their respective owners and are used only for compatibility description.