From:Gene M e-mail:gmdrafter-A-gmail.com
Subject:Gel cell power Date:Fri Sep 7 16:19:07 2012
Question is; Will the existing Harley generator actually replenish these gel cells? Or do you purchase a special charger or discard and replace when dead?

I found a 6v 4.5 ah gell cell at Tractor Supply for $9.99 they are so small you could probably install a couple and hook them up in parrallel to fill the battery box.