You will need
  • Laptop battery
  • Mains
If you want the laptop battery to serve you for a long time and did not fail at the wrong moment, don't let it sit completely. Periodically charge it.
If you are working with mains supply, remove the battery from the laptop. This will keep its potential.
The battery to produce just about the laptop or stationary charger for laptops (it is sold in computer stores). Any other devices can bring a battery failure.