You will need
- Laptop battery
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.
Pay attention to some nuances. If you don't use the battery for more than two weeks, it can fail. It is connected with process of loss of capacity in the battery. So the rule is "prophylactic" charging batteries of the laptop.
If you're on a laptop often and continuously, get two batteries. Until one goes down, the second is charge that will allow you not to worry due to the fact that the battery is discharged inappropriately, and replace it with nothing. In this case, you will definitely need the wall charger.