My old battery charger died the other week. I got this one off of Amazon.ca. It fests if a battery is good/bad. Also tests load and starting functions. It is very small compared to the old heavy one. It does not boost though.

Battery Tester 12v Battery Charging Car Battery Tester Charging/Cranking Test 100-2400 CCA Battery Maintainer Smart Charging 12 Volt Battery Charger with Reverse Polarity Protection for 12V Vehicles : Amazon.ca: Automotive
Battery Tester 12v Battery Charging Car Battery Tester Charging/Cranking Test 100-2400 CCA Battery Maintainer Smart Charging 12 Volt Battery Charger with Reverse Polarity Protection for 12V Vehicles : Amazon.ca: Automotive
www.amazon.ca