I just ordered 2 - 36v 20AH batts to extend my range, and on a side note, I replaced my back battery box with a new one of the same type and did NOT put the subwoofer back in and hooked up a smaller amp to just power the two tweeters and one midrange on my handlebars. The subwoofer was just too heavy for the box's material to hold it well.
WHEN (not if) I get my new diamond plate aluminum box, I will put the subwoofer back (along with the neon) because..
1.) The diamond plate will hold the sub VERY securely.
2.) I think I will get much better bass out of it.