4-Bank Battery Tender
Product Review (submitted on January 25, 2010):
Love the product, the quality, ease of use, etc with one rather annoying exception. The eye-ring connectors supplied with the unit DO NOT fit on side post batteries. You'll need to purchase something additional to hook this up if that's the case. Be sure to check how you'd attach it BEFORE you buy (assuming you'd rather not use the alligator clips)... It's annoying to find out after the fact that a great product is marred by a major design short-coming.