Quote:
Originally Posted by London Lad
What do they mean by 'sonically tested' ???
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I have no idea what this means, but the reality is ANY good battery charger or battery tester will tell you right away if the battery is bad or not. Modern testers are all digital. But a really good battery charger or tester is not inexpensive. If you're working on modern BMWs you need sophisticated tools like this Snap-on Charger ($830):
https://store.snapon.com/Battery-Cha...--P744410.aspx
Or tester ($735):
https://store.snapon.com/Electronic-...m-P647261.aspx
Yes, Snap-on stuff is crazy expensive, and there are other good brands that are somewhat less expensive, but this is what you're going to find typically in a good indy shop.