How good are battery analysers.

Submitted: Wednesday, Dec 23, 2020 at 15:49
ThreadID: 140895 Views:10134 Replies:10 FollowUps:24
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For the last 12 years I have only used flooded batteries under the bonnet.
I could easily test their capacity with a hydrometer.
Recently I replaced them with 2 Century Dual Purpose AGM’s each with a CCA of 760.
Next, I purchased an AE310 Battery Tester to set up my base line capacity for future reference and it showed the CCA of this battery at 32c as being 920 CCA.
This test doesn’t put a load on the battery and I can only assume it is measuring its internal resistance to approximate its CCA.
Does anyone know how these things work and how accurate are they?
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