I found this link useful. Very similar set-up: https://www.youtube.com/watch?v=tELJO1BMSYY
My DS4 battery died after only two years. surprised nad not happy, even though warranty covered it all. Still, inconvenient.
Regarding the negative terminal, there's an unpainted, round "button"-thing at the front right of the engine bay. Your manual should have it illustrated. If not, Google is your friend.
Hi. Interested to see that you got your battery replaced under warranty.
My battery has been found to be not doing its job after less than 2 years and my dealer says I have to pay for a new one since its more than 6 months old. Its the original factory fitted one and it makes no sense to me that it doesn't carry the same minimum guarantee of at least 3 years.
How did you get your dealer to do the logical thing?