Could not find one like my old trustworthy charger that I use but found two to give you a guide line as to what to look for on the internet - I am NOT recommending the supplier - just suggesting to look at the charger types and rough cost ideas.
1) once problem is fixed - to keep your battery fully charged on a little used vehicle
look at : http://midwayautosupply.com/detailedproductdescription.asp?3298

2) To get a safe charge into a dead or weak battery withour overcharging in case you forget you have it hooked up- look at: http://midwayautosupply.com/detailedproductdescription.asp?3300
This will give you an idea of what to look for.
Morris