You will loose your radio presets and clock time. You will have to reset the clock and radio presets and that is all.
Computer should restore all the settings after driving for a while.
Most, if not all airsoft guns have accessible and changeable batteries. On most occasions you will have to take out the battery to charge it.
Most likely you need to change its batteries.
No, all you need to reset is the clock and radio presets.
That all depend's on the friends' friend's settings. You can change your settings to allow "Friends of Friends" to view your profile, so it all depends on what that friend of a friend's settings are.
I'm going to have to change some of the settings on the television. The frequency settings on the radio have all been changed.
Take out all games. then turn on. then change in settings.
If they were fully charged when you put them away, they should be fine. They will loose their charge over time but it should not hurt them.
Change all of them at the same time, as otherwise the weaker ones will make the newer ones fail more quickly. Note that some smoke alarms no longer have replaceable batteries, since you need to dispose of a smoke alarm after 8-10 years anyway.
DC definitely, all car batteries - all batteries.
Any jeweler can do it. Many stores that sell watch batteries can, but not all.
Sanyo produces rechargeble batteries of all sizes, cell phone batteries, laptop batteries, and batteries for digital cameras. Almost all of your battery needs can be met with Sanyo.