the ctek ones are prob the best around or an oz charge. they work a treat, ive sold stacks over the last few years. heaps more efficent and easier to use than the old chargers and you dont have to worry about boiling the battery cause the unit tests the battery constantly and when its got enough charge itll cut out best of all with a charge and maintain unit you can plug it in and forget it, it will maintain the batt at a constant 12v so when you goe to use the bike/car its never flat. gold