Personal digital assistant
PDAs are powered by batteries. There are two types of batteries: removable and fixed. Older PDAs used alkaline batteries which the user would have to take out and replace when they ran out. Most new PDAs have Li-ion batteries. These batteries are rechargeable. PDAs use more battery power when playing video, accessing Internet or transferring data using Bluetooth. Large and bright screens also take more power. This makes the battery run out faster.