Cleaning Battery Terminal?

Hi, from what you are saying it sounds like the battery is flat, see if you can get someone to give you a jump start, or put the battery on chargefor a fuew hours, then try again, all the best hope you sort it.

If you buy a new battery, most stores will help you replace it. you will need a ratchet set to remove the positive and negative ends of the terminal. you should remove the positive end first. and for the new one, add the negative end first.

Yes, you can replace the cable end.

May be something as simple as corroded battery terminals or clamps.
Grab the battery cables and try to rotate both clamps a little.
If it then tries to start, then it is time to pick up a terminal/clamp cleaner from any parts store.

Remove the negative (black cable) first and clean both the clamp inside and the terminal outside, then reconnect- negative terminal last

It may be wise to buy also a small device which uses a 9V battery to connect from clamp to clamp (or plug into the lighter/power socket) unless you have the code available to regain access to any stereo you have; most go into a anti-theft 'safe' mode.

Have you checked the battery?

Your problem may not have been the battery at all, but corroded connections somewhere between the battery and the starter.
Disconnect the negative battery terminal (always) first, then the positive. Inspect the cables at the battery clamps and make sure they are not corroded away under the insulation by flexing them close to the clamps. If they bend easily, you need new cables.
If those appear to be OK, follow the positive (red) cable down to the starter or solenoid terminal, remove and clean this.
Follow the negative (black) cable to its other end (could be chassis or engine block), remove and clean this too.
If the starter still isn't responsive, the starter (or solenoid if separate) may have failed.
Whether external or internal, the solenoid has to handle 100-150 amperes which caused the heavy copper contacts to eventually arc themselves to death, often by becoming intermittent at first, then not contacting enough to supply current to the starter.
If the starter has a hump on its side, this is the solenoid and is replaced with the starter. Some vehicles use an external solenoid (this is just a very beefy relay) and you may have found it while cleaning connectors.
When RE-connecting the battery, always connect the negative terminal last.

Boiling water is the best way to clean the corrosion from terminals.Then use some sandpaper to to clean the battery terminal and the clamp.Put it back together and coat terminals with vaseline (petroleum jelly) this will stop further corrosion.

Having a full charged battery won't just solve the promblem. You might want to check with the battery terminal connection on the postive+ and negative-, It might be corroded, grease, or acid build up, so check for thse signs, also it could be that clamps are not fully tighten. You still can get power to the car from the baterry which in this case is leads to the immoblizer lights on the dash boards to stay on, but the terminal are corroded with acid, grease, or just from dirt, and with these element in presence, the battery is not fully ground. The engine needs a specific amount of amplitude from the battery for the engine to crank. A kia sorento v6 engine needs alot of cranking amp. So my solution is, check the battery connection terminal on the battery and the cable (positive and negative connections) de-tach the cable connections, clean the connection cables which are the adapter to the battery, and the battery terminals, with a toothbrush or high grit sandpaper until dirt, acid build up, grease are gone, and reinstall the cables. See if this will help.

I would bet your guess is the correct one,
cold weather is the killer of batteries,you need to chose one that has high cca's
Cold Cranking Amps, the hight the number the longer it will turn your engine over in the cold before dying.
the blue color around the battery post is corrosion,the best way to get rid of it is to pour hot water on it,
"not pepsi" like some think because it will just return.

clean and tighten the battery terminals they must be clean and tight it sounds like it's loosing connection and this should fix it