Finally got around to measuring the internal resistance of both 6 month old contestants with my Junsi 306B charger that can do IR:
Optima D31M Blue Top (light case) 75ah (classic pure-lead)
3.4 mOhm
Exide Edge FP-AGM24DP 75ah (dual purpose, GRAPHITE additive. Also seen rebadged as a Rural King model)
3.7 mOhm
Measurements were made on the screw-thread terminals of each, which might account for being slightly higher than published for Optima. I can't find the Exide spec, so I measured it myself.
There are still differences of course, but I'll need another lifetime to find out and test it all.
The low internal resistance of the Exide pleases me, as that just enhances solar charging. Looks like graphite was a good idea.
Optima D31M Blue Top (light case) 75ah (classic pure-lead)
3.4 mOhm
Exide Edge FP-AGM24DP 75ah (dual purpose, GRAPHITE additive. Also seen rebadged as a Rural King model)
3.7 mOhm
Measurements were made on the screw-thread terminals of each, which might account for being slightly higher than published for Optima. I can't find the Exide spec, so I measured it myself.
There are still differences of course, but I'll need another lifetime to find out and test it all.
The low internal resistance of the Exide pleases me, as that just enhances solar charging. Looks like graphite was a good idea.
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