When a new battery was put into 07 Honda accord;although, for the first 2 seconds the battery was connected reverse(-+/+-) the mistake was quickly corrected but now there is no power at all and the ba

You may have blow the fusible link. Its the thick red cable attached to the positive battery post. The cable itself has the link in it (par of it, however you want to term it) If its blow the cable will have a bulge in it, not far from the post. If its bulged out its blow and will need replacing. You can test for it by testing for continuity in the cable. Disconnect it from the battery. Test between the cable terminal and before the bulge, reading will be 0.0 after the bulge no reading at all.

When a car battery is places on reversed polarity, you create a short circuit, try checking your fuse box, and replace if any is blown