What would you do without them? Seriously, if every single battery of every single type were suddenly zapped out of every single thing that it operated, what would any of us do?
If you have your PC case off you will see something on the motherboard that looks like a small thick silver coin. That is the battery. There are other types of battery used on newer machines (Ni-Cad, NVRAM) but these much less frequently found and so I won't discuss them further.
Most of the laptops now a day are equipped with cobalt ontario-ion batteries. Though there are Nickel-cadmium, Nickel metal hydride, etc, after the invention of Lithium-ion battery, because of its efficiency most of the laptop manufacturers are selling it along with their respective laptops.
You can buy cheap cell phone batteries for any model. Every cellphone model has an appropriate cellphone battery that works best with these. But a cellphone battery from the same brand may not work with the other models.
The Makita BDF452HW cordless drill comes with an 18-V Lithium battery stocks-ion battery and it charges in only 15 minutes. That's a much quicker charge time than almost any other drill you can find. Along with the quick-charge, the battery life is also very good so you don't really have to worry too much about it dying on you.
All power tool batteries degrade over time and Lithium mines Ontario ion batteries degrade more rapidly over periods of un-use. Accordingly, use them often and when you're not in the trenches of a project, try to use them at least once each month.
I could easily have spent a fortune replacing the motherboard, the memory, the processor etc when it all came down to 2 dollar battery. What's more is these batteries are easy to get. What you need is a CR2032 available at most hardware stores like home depot and I've even seen them sold in Safeways. Of course every reputable computer store should stock them. Just check to make sure that your PC uses a CR2032 before you go to the shops!
With any battery, every time you charge it, it loses a bit of its performance and power. Over time, that battery will die, and after you give it a proper funeral, you'll have to change it. The same is true with your iPOD. Eventually, you will have to replace the iPOD battery. You can either change the iPOD battery itself or purchase a new iPOD Nano . But, because your iPOD battery is a lithium-ion beast, you won't need to worry about that for a while!