This guide will assist you in putting a replacement battery in your 996. There are several different options you can go with in terms of a new battery. I went the route of several other GT3 guys and picked up the Duralast 48-DL. It was just over $100 (tax included) once you return your core.
First step is to pop the hood and remove the battery panel cover. Simply twist the two tabs shown below 90 degrees to release the clips. Pull the panel up and out.
Grab your ratchet and 10mm socket. Un-do the positive terminal clamp and pull it off the battery.
Move to the other side and repeat with the negative terminal
Next, locate the vent tube on the battery. Simply pull it off to remove
Last step to remove the battery is taking off the lower clamp. Grab a 13mm socket with an extension and remove the bolt shown below. With the bolt removed you can take the clamp out. Remember the orientation for installation later
Battery is ready to come out now
To remove the battery, slide it toward the passenger side of the tray a little bit. Grab the handles and pull it out. Be careful as it is a little heavy.
I am pretty sure the battery i had installed was not the OEM battery. I put it on the scale and found it weighted about 36.9 pounds. I put the Duralast battery on and weighed it in at 34.4. Saving a little over 2 lbs with the new battery.
Pop on the vent tube that was included with the new battery
You can now drop the new battery in the car. Goes it the same way it came out, exact fit. Once the battery is in place, re-insert the lower clamp and tighten the 13mm socket. After you are done check for movement. If satisfied move on
The OEM 90 degree elbow for the vent tube will not work with the new battery. You need to remove the elbow from the stock tube by simply pulling it off
A shot of the new vent tube adapter that came with the battery
Small end goes on the vent tube connected to the car and the larger end connects to the new battery vent tube as shown below
Throw the positive and negative terminals back on and viola! You have successfully changed the battery in your car. Check to make sure everything is powered. If all is good, pop on the panel cover and go for a ride!
If you have any questions or concerns about this DIY tutorial please feel free to comment or send me a private message. I hope you have benefited from this article. Always check back for new articles posted here on Euro Addiction