The above-mentioned item is a high-quality, compatible battery for your ThinkPad R400. It is an excellent replacement battery for your existing or defective ThinkPad R400. It can also serve as an additional spare battery for on-the-go use. Handling and charging are as usual, easily done with the standard power adapter 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 greater number of charge-discharge cycles, which means a longer lifespan for your new ThinkPad R400 battery. Quality is our top priority. This means that 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 manufactured or recommended by them. All brand and product names belong to their respective owners and are used solely for compatibility description.