Generally the CMOS battery will be located on the computer's motherboard. You will have to disassemble most of the laptop if there isnt a panel that will allow access to the battery. The type of battery that powers the CMOS is usually CR2032 cell battery (Sometimes known as a watch battery), or something similar. I found one guide ehow for the 6200, but in all honesty, if you have taken apart a laptop, then you'll be able to figure out a way to open up both of the computer's and find the battery. http://www.ehow.com/how_7403851_replace-cmos-battery-averatec-6200.html
Do what Brad has recommended if you haven't done so already. If this doesn't work, are other applications that use the motion sensors in the iPhone working? For example, some sort of racing game or temple run?
The macbook pro you have has soldered on CPU. You cannot change it without the appropriate equipment. Also, a Xeon chip will probably never work with your computer's chipset in the first place, and Xeons are a socketed CPU, not soldered. Im pretty sure your stuck with your CPU.
Yes, I agree with Old Turkey, just follow that guide and use the tools you need. If you really are going to fix it yourself, here's a top screen replacement that you can buy: http://www.ebay.com/itm/Top-Upper-Replacement-LCD-Screen-for-Nintendo-3DS-N3DS-/170854909103?pt=LH_DefaultDomain_0&hash...
That may be the problem, but if you got water in the 3DS, then you might have other problems to worry about other than the battery. You might want to open up your 3DS to check for damage, or if it hasn't been too long, put in rice or one of iFixit's Thirsty bags if you have one. If it really was ONLY the battery that was wrong, then you would need to replace it. Have you heard of the Rice method?
This usually means that a ribbon cable is disconnected. I would open up the top part of the clam shell, and Check all the ribbon cable. Use some tweezers if needed since you have big fingers. BUT! Be careful, those ribbon cables are delicate, along with the fastener clips (the black clamp where you fasten down the cable). If the cables in the top shell are properly fastened and they aren't damaged, then you might have to check the cables going from the sister board (Top shell) to the main motherboard (bottom shell). Check for damage, and check to see if its properly fastened into the both the motherboard and sister-board. Hopefully you have a Tr-wing bit (or screwdriver) to get into the bottom part of the DS.
You cant change it, and also, you cannot transfer data between a Japanese 3DS and a English 3DS. Gamestop CANNOT do that either. Plus, data saved on the SD Card of the Japanese 3DS also cannot be transferred to ANY 3DS what so ever, besides the music and pictures you put on it yourself.