They do still make bat caps, and are nice to use. I am on a bunch of audio forums and know people who still use them. As to the battery being a bad cap comment, anyone who is serious into audio does not use caps. They discharge too quickly, and store too little power. 1 farad is equal to roughly 1 second of power, nice little demo huh? Look into putting maybe a Yellow top back there instead of the cap and you should be fine. The stock alt is I believe 105 amps? So that, a nice batt up front, maybe a red top, and then a yellow top in the back should hold you over for a while. Batts hold more power than a cap and discharge slower so you can get more power out of them. If you need some good proof here is a link: Click here