Just got this tester today from Amazon: https://www.amazon.com/gp/product/B00IZFNJ6Y. It works great! Highly recommended!!
Tested a 3 year old suspect battery in my 2008 Saab 9-5 with it, first. The battery is rated at 895 cranking amps and actually tested at 1000 cranking amps! I'd say that's a good battery! Then I tested while cranking, also passed. Then came the charging system test (both unloaded [nothing on in the car] and then loaded [everything on in the car]) and it all passed with flying colors.
Again, highly recommended!!
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