Battery Beak

[Siri]

Originally Posted by Mark McLeod

The middle and right are the same battery after 10 minutes on a charger.
.026 (no surface charge) to .029 (with a surface charge) is the 10% difference you mention.
I'm waiting for the surface charge to dissipate again now to see if the resistance drops and the Beak returns to a Good rating.

So just to make sure I understand, if I use the Beak on a battery I just finished charging in the pit, the Good ones will read "Fair" because of the higher Rint? (Do Fair batteries read "Bad"? Bad ones still read "Bad"?)

What's the minimum percent Charge that still indicates a surface charge to you (somewhere between 130% and 113%, I take it)? Is surface charge ok in actual use of the battery?

Thanks! I suspect these are stupid questions to anyone with a modicum of practical EE knowledge, but I regret I'm not really one of those people. I do need to fix this.