Battery removeal were is the battery and what size

Always remove the negative battery cable first. That will avoid the possibility of causing a spark trying to remove the positive first.
So you take a wrench and remove the negative post. If it is a sidepost battery, use an 8 mm wrench to remove the center bolt on the cable. If a top post battery, use the appropriate wrench to remove the negative cable terminal.
Now you can safely loosen and remove the positive battery connection.
Battery is now free to remove, but wait, there is a holding fixture on most batteries so it won't move around or tip over. Either a top bracket that hold battery stable, or there is a small little block at bottom of battery, like a wedge, to hold it secure. This block or wedge is retained by a small bolt, usually 1/2 inch size hex on the bolt (or 13 mm size, which is very close to 1/2 inch). remove this holding block or wedge and battery should come4 out. On some GM models there is a brace which is over the battery, and this brace must be removed for battery removal. Take one end of brace loose and swing it out of the way.

it battery size 371/370

At any walmart, grocery or drug store. They cost less than $5.00

It's only a watch type battery and the most popular is the CR2032, but take the one inside of your computer out and make sure you buy the same .
Laptops:
Most laptopsrequire you to take the laptop apart to get to the CMOS Battery. It willbe a silver battery about the of a nickel on the motherboard. Themost common is CR2032. Also sometimes the battery will be in a vinylcovering and have a cable that attaches to a port on the motherboard. Whichever type you have you'll need to either remove the battery or unplug the cableand let the laptop sit for an hour or two. Then put it back, reassemblethe laptop and reboot the laptop. With the CMOS battery out the computerwill lose the date, time and password.Desktops:Remove the Power Cord, Remove the Case, sit the computer on it's side and look inside with a flashlight. You should see the cmos battery sitting somewhere on the motherboard. It will be a shiny silver watch type battery about the of a nickel Just use a small flat head screw driver and pop it out.

Went to amazon and found these.
Entop, green battery, R6P, UM-3 Size AA 1.5V

can you remove the cmos battery? some batteries are soldered in making it hery hard to remove
remove the cmos battery for 15 - 30 minutes this will remove your password and cmos settings
if you are working on a laptop on the underside of your laptop you will see removable plates use a phillips head or a flat head screwdriver to remove the plastic plate then remove the cmos battery it could differ on size might be the size of 10 or 20c piece
http://www.pchub.com/uph/category/307/Battery---Cmos-Cover.html
hope this helps you

First remove Hold down clamps . Next remove cables , negative first then positive. Then remove the battery,its a good idea to wear gloves and eye protection when doing this.

You must find out how many Cold Cranking amps (CCA) your car needs to start, thats the size battery you purchase. Make sure its top or side post and same physical size as possible as your old battery.
Installiation is the reverse of removal.

first open your laptop back side then you will in your circuit a battery which size verify in different pc or laptop model and size. like it can most time Casio battery A3 size. and now watch that is your cmos battery is fixed or removal. if fixed then remove it by professional technician who use Iron or soldering. but if it is removal then remove the battery and replace another one which size and voltage is similar with the older. thanks

If you do not have the manual for it, you may need to remove the back cover in order to see th battery type. If removing the back proves too hard, a jeweler may do it for free or minimal charge. I got my battery from a dollar store and is a good name brand.Easy to install yourself.