Received my spiral agm battery ordered from China and have it installed. So far so good. The terminal is a bit smaller compared with what we have here though. I'm running out of copper tape so I use aluminum foil to wrap up the terminal.

Bro., I need you advice.
Remember the Innova that died, immediately after the (-)ve terminal was removed.

Today, the home call and reported the new battery had failed.
Date of installation 14/2 the new battery was in high state of charge 12.6V with 597 CCA
Today 21/2, in just a week, the voltage had dropped by 11.78V with 108 CCA balance ???

Also when inspected closer this Innova it appears to have had a frontal collision because the materials and workmanship inside the engine bay does not look like it came from Toyota either. No wonder the 2nd hand car dealer was so eager to unload this by throwing in a Rm7k discount just to close the deal. 😨

Could a serious collision affect the electrical circuitry so much, that it has affected the battery until this state ?