No, it doesn't. You just charge it with the charger that it comes with and it should be fine.
No the DS does not require a memory stick. This is mostly due to the fact that DS carts run on flash memory, which means that you'll never have to worry about dying in cartridge batteries. (Remember the old days when you owned an NES or SNES and you played an RPG, put 20+ hours into the game only to find your game save wiped away? Well that was because the save chips were powered by batteries installed in the carts) Flash requires no batteries for saving, whici means the memory is already on the DS carts themselves.
have you tried to turn it off or take the batteries out
no, it does not need batteries because it is powered by the sun.
It allows you to use mains power instead of batteries
you need 3 x AAA batteries. Also it's better to use alkaline batteries not rechargeable batteries.
No, the Barrel Break IX-2 does not need batteries.
3 double A batteries
You will neeD 235 batteries
All wireless headphones do need batteries.
Wii remotes need two double A batteries to work.
You need duracell batteries.
No, corded mice use the computers electricity thus do not need batteries.