In a way, there are. USB is a standard across the board--it will always give you 5 volts. This means any battery pack designed for a mini-USB device (like a Blackberry phone) will work for you. Just make sure your device can charge through its mini-USB port. If it can, head to your nearest department store's cellphone accessories aisle and see what they have for "emergency" chargers. Energizer makes one that runs off two AA batteries and should set you back $10-$15.
Higher capacity battery packs, as well as external battery packs, can both be used to extend play time.
Yes, you can buy them at most department stores.
The Canon entry-level camcorders have great battery life, and you can buy external battery packs to add even more juice.
There are a variety of places that sell DeWalt battery packs. One of the most reliable dealers of the battery packs is the manufacture DeWalt but a secondary option is Amazon.
Size A batteries are/were available for use in older laptop battery packs or hobby battery packs. The important words here are 'battery packs' so they are not available as single units.
No.
Laptop battery packs can be purchased at any computer electronics store. These stores include Best Buy, Apple, Amazon, Battery Depot, and even on Ebay.
Usually prices of batteries/battery packs have to do with how high the battery life is.
Obviously Gold Spaka Boy !!! Rooney packs I find give the best players if that's what you meant.
There is different places to get your rc battery packs. Amazon says they have it I beileve. I would also check craigslist if I were you, it would be really cheap there.
The only places I could think of that you could try to get a good deal on battery packs of different kinds and sizes would be Battery Plex, online. You could check eBay too.
The FlipPort, which is part of the new Flip camcorders, is essentially a proprietary accessory port that supports a number of Flip attachments, including external microphones; a video off-loaded if the memory fills up; and battery chargers or packs.