Where is the battery location for my 2007 vstar 1100. and how often do i need to charge it.

Battery is under the seat. Buy a battery tender and keep it hooked up when not riding in the winter. If you are in an area of the country where you can ride year round then a battery tender is not necessary. Battery will probably last 3+ years if properly maintained. I owned a 2000 V-Star 1100 Classic and it was a fine bike.