I want to change the battery on a C9 by Champion Womens Plastic Strap Digital Watch - Black/Silver/Pink. What type of battery is used and how do you do it?
To change the battery in a champion watch:
(1) remove the back, (2) carefully peel loose the foam strip and set it aside (3) release the battery retaining bracket with a needle or awl and tweezers, (4) grasp the case with your thumb and forefinger so that your thumb is holding the works inside the case, (5) turn the watch over and the battery should fall out (6) put the new battery in the holder, (7) snap the retaining bracket back in place (8) replace the foam strip (9) replace the back 
You want to be sure you know what you are doing. Opening the back, you will see the existing battery so replace the same. The challenge is closing the back. Be careful or you may end up with a watch that runs but cannot close. Just alerting you. An expensive watch s/b taken to a jeweler. Battery will cost you 7-10 bucks.
the battery may need replacing
HOW TO START YOUR WATCH
To start your watch remove the plastic guard from
under the crown, then press the crown in against
the case. The second hand will begin advancing in
one-second intervals.
Some deep-depth water-resistant watches require
the setting crown to be screwed in to secure
water-resistance. If your watch case has a protrusion
with screw threads, the crown must be screwed in
after setting the watch.
To screw in, push the crown firmly against the
threaded protrusion and hold in while turning the
crown clockwise. Continue to screw in the crown
until it is tight. You will need to unscrew the crown
(counter-clockwise) before pulling it out the next time
you want to set your watch
Choose a quiet, well-lit room where you can replace the battery in your Casio Pathfinder watch. Prepare a table, desk or other clean, flat surface where you can perform your watch repair. Put down a soft cloth or piece of craft felt to protect the face of your Casio Pathfinder watch from being scratched during the battery installation process.
Set your Casio Pathfinder watch face-down on the soft cloth or craft felt. Use an optical-sized Philips screwdriver to remove the four screws that secure the watch back to the body of the watch. Set the screws aside, but don't lift the watch back.
Slide the watch back off of the body of the watch very slowly. There are three important springs held underneath the watch back; it is essential to remove the watch back slowly to avoid losing them.
Lift the three springs out of your Casio Pathfinder watch using a small pair of metal tweezers. Take note of the length and placement of the springs as you remove them. Set the springs aside with the other disassembled watch components.
Take the black rubber protective disk out of your Casio Pathfinder to reveal an identically-shaped white plastic disk. Remove the white plastic disk and set it and the black rubber disk aside. Use your metal tweezers, if necessary, to lift out the rubber and plastic disks.
Release the battery strap that holds the battery in place in your Casio Pathfinder watch by pushing the battery strap latch to the left. Remove the old battery from your Casio Pathfinder using a pair of small plastic tweezers.
Pick up your replacement watch battery with the small plastic tweezers and insert it into the battery compartment of your Casio Pathfinder watch. Replace the battery strap and push it gently with the tip of your plastic tweezers to snap the latch in place.
Touch the "-" and "AC" terminals on your Casio Pathfinder watch with the tips of your metal tweezers for at least two seconds. This helps ensure that your watch will work properly once reassembled.
Put your Casio Pathfinder back together to complete the new battery installation. Start by replacing the white plastic disk, followed by the protective black rubber disk. Use your small metal tweezers to replace the small watch springs in their correct locations. Replace the back cover of your Casio Pathfinder, insert the four screws and tighten them with your optical-sized Philips screwdriver.
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