Having problems with your 2004 Honda Accord ?
Battery problem, big cable is swolen - 2004 Honda Accord
You have a bad battery that is leaking and the acid has gotten inside the protective plastic coating on the cable.. more than likely a new battery and a new cable is needed.. IF it is the black cable it is a easy repair, the red cable will need to be removed from the starter and has a pigtail going to the alternator. this is quite a bit more involved. You may want to consult a mechanic for the (red) positive cable replacement
This is caused by battery acid intrusion, the cable ,must be replaced.
Repair Help & Product Troubleshooting for 2004 Honda Accord
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