Changing a car battery is something that most people will be able to do themselves. The hardest part is usually to lift it out of the car once it has been disconnected because it's weight. Keep track of your battery's life and replace it before it leaves you stranded.
https://www.pepboys.com/parts/batteries/diy_replacing
Start with the positive terminal. Remove the plastic cap and use your battery terminal cleaner to brush the new posts. This will score the metal lightly, which will provide a better grip between the posts and the clamps, which provides easier recharging of your battery while you drive.
http://auto.howstuffworks.com/under-the-hood/vehicle-maintenance/change-car-battery4.htm
At this point, try your car's ignition. It should start right up if your battery was the root of your car's trouble. Since the battery was unattached, you may have lost information in your car's onboard computer. This might require you to re-enter a password for your radio and other features to operate once more.
http://auto.howstuffworks.com/under-the-hood/vehicle-maintenance/change-car-battery4.htm
1 Clean the battery cable connectors with a wire brush. To remove heavy corrosion from the connectors, use battery-cleaning solution.  Place the new battery in the battery hold-down tray and secure the battery with the hold-down clamp.
https://www.pepboys.com/parts/batteries/diy_replacing
Follow these tips to keep your battery—and your hands—in tip-top shape. Author Copy Created with Sketch. Q: A friend of mine told me that I should always disconnect the positive terminal of the battery first to keep the electricity from spilling out of the battery. I can't see how this would matter. I just unhook whichever terminal is closest first. I've never noticed any spilled electricity, and I think he's just pulling my leg. A: Let me relate something that happened to a friend of mine, a dentist by trade who likes to work on his sports car occasionally.
http://www.popularmechanics.com/cars/how-to/a1454/4213127/
Your new battery may have come with colored plastic caps on the terminal posts. Don't remove them until you've situated the battery and are ready to attach the terminal cables. These caps will help you remember which post is positive (the red one) and which is negative (the black one).
http://auto.howstuffworks.com/under-the-hood/vehicle-maintenance/change-car-battery4.htm
When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. BikerBob · 8 years ago.
https://answers.yahoo.com/question/index?qid=20080608103057AA0v7rI
1 Attach and tighten the negative battery cable (Black).  Ensure that all cable connections/ hold downs are properly tightened. Check the security of your battery by trying to move it back and forth. If you can move the battery cable terminals at all, your car may not start due to a weak electrical connection.
https://www.pepboys.com/parts/batteries/diy_replacing
1 Detach the positive (red) battery cable from the battery using the same method. 2  Using a combination wrench or a socket and ratchet, remove the battery hold-down clamp.  Take the battery out of the battery tray. Batteries are heavy, so grab from the bottom using both hands.
https://www.pepboys.com/parts/batteries/diy_replacing
I would just touch the negative cable to the battery first to make sure everythings hooked up correctly. When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
https://answers.yahoo.com/question/index?qid=20080608103057AA0v7rI
which battery terminal do i connect first
The battery terminal that you connect first is the positive or red. You connect first Positive or red battery terminal. The positive battery terminal you should connect first. You should connect first at the positive battery terminal.