Battery Help!

Technical Electrical
1

We just bought 12 brand new batteries and the Rint on the battery beak shows 0.022 and 0.023 on all of the ones I’ve opened. This is way higher than I expected and higher even than our current batteries, which have been used in 9 events so far this season.

What am I missing? The batteries are brand new, Duracell 12V 18Ah batteries.

2

From the Battery Beak Manual:

Internal resistance (Rint) is calculated using
the ∆V/∆I method. Two different loads are applied depending on
battery chemistry selected, the voltages are measured at each
load. Rint is calculated by dividing the difference in voltage by the
difference in current.

If you’re beaking just as the battery comes off the charger, it’ll be depleting surface charge while doing this load test, which could result in the measured internal resistance measuring higher than it actually is. Try waiting ~15 minutes after the battery is fully charged before beaking

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3

A couple other things to contemplate:

  1. Battery Beaks age–in particular, contacts get worn from all those couple-decouple cycles. It sounds like that’s higher than what OP is seeing on batteries measured with the same Battery Beak, but it’s worth noting if you’re comparing against others’ measurements.
  2. It is possible that you got an old batch or a bad batch. Judging from the noise raised on CD by other brands’ bad batches, I don’t think this is likely. But it is possible.
  3. Batteries do tend to perform a little better once they’ve been run through a few charge-discharge cycles. Don’t be a total fool with them, but a few drive practices at moderate intensity will probably help.
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