For example, if a battery says that it has a standby of 300 hours, it means that if the phone is left on but not used, the battery should last around 300 hours. This has to do essentially with standby time on your PDA. The usage time of a battery differs drastically from its standby time. A lot of people tend to buy an extra battery only if they lose their PDA a lot, and need to have an extra battery lying around in case they ran out of power on their existing battery.

Extra batteries come in many forms, but the size is specific to the model that you own. Some PDA models can be installed with a super battery, which has a longer life than the current factory installed battery on your PDA. These batteries tend to cost a little bit more than normal, but perform far better than a standard battery. If you choose to buy a larger and don't battery for your PDA cover for larger battery will also be included in the package.

Apart from this, you can always buy a standard extra battery for your PDA. Nowadays, there are many manufacturers generic in nature making batteries for all types of PDA models of different companies. Here, you will find a large range in prices for the same kind of battery. It is to be noted that just because a battery is cheaper does not mean you should buy it, as the price of the battery may be lower because it performs very poorly as compared to a standard battery. Be sure to look around, and read reviews before you end up buying a new battery. You can also consider buying a battery extender, which provides an instant charge to your phone’s battery in case you need it in an emergency.