Take the connectors off and flush with lots of hot water to remove all acids. Then reassemble and tighten properly using plenty of acid free grease/ grease for electrical coonectors.
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when the battery leaked on top of the battery ?
It would have had corrosion on the battery terminals like a white chalky residue ?
You may need to get a rat tail file and gently file the inside of the terminals to clean the corrosion off or buy new replacement battery terminals and reattach to the battery cables.
If you have a volt meter put the negative probe directly on the negative battery post and put the positive probe directly on the positive post of the battery. If you read 12 volts then try doing this on the battery terminal connectors and see if they read 12 Volts.
Corrosion might be in the cables depends on how bad the leak was .
Maybe the deep discharge on battery trashed it and now it will not take a charge. Sure the charger is working? Give it enough time to charge the battery - at least five hours.
Your positive battery post has lost its seal with the battery case. This lets a small amount of gas to escape from the battery.
That gas causes the corrosion that you have seen on that terminal. You can get a battery terminal spray that coats the terminal in a waxy/ grease that will stop this happening.
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.
Assuming top post battery terminals, sometimes where the cable enters the terminal end corrosion builds up. Take it apart and wire brush everything real good. Always tighten the positive first then the negative. They make battery corrosion protection spray but grease or petroleum jelly works good too. If that doesn't do it, check if it has an aftermarket alarm system. That may be killing the start circuit. Good Luck!
The fact that you can still play the radio is not necessarily an indication that the battery is strong enough to crank the engine over. What do you hear when you turn the key to the crank position? Do the interior lights dim when you try to crank the engine?
How old is this battery? In climates with temperature extremes, about six years is all you can expect. In moderate climates (neither extreme cold or hot) 8 to 10 years.
Have you examined the battery posts to see if there is any sign of corrosion? Battery post corrosion is not always visible but usually it is.
Do you have sealed battery cables? If you have the ones that are stripped with a clamp (shown below), then you should change the cables out to sealed.
You don't want corrosion on your cables or battery. Follow these instructions to clean and prevent corrosion on your battery. The corrosion may be hindering the connection of the battery post/screw and cable.
To do a good job if you havent already done it is to tip hot water over the battery term and it will dry clean ,,if corroded term then replace it but you dont have to buy with a new lead ,,only a positive term only and then hot water over the battery lug when new term on then spray with Hair spray .
If battery cable dident corrod with other battery then your battery is either charging more than 13.5 volts and or battery post to battery is cracked
Wash and spray then check first
i would check wiring.....make sure that both the ground and teh positive posts and wires are free of corrosion.....if they have corrosion clean and repair it....should be an easy fix.
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