hello, i´ve owned my 03 Speedfour for six years and have really enjoyed it. i´ve got about 24,000 miles and just this past week the battery keeps draining. it´s a battery that´s less then a year old. i have it on a trickle charger and the battery takes the charge and runs good for about a day or two, then it won´t turn over when trying to start it. is this a battery issue or an electrical issue?