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Ahhh, that makes sense. I guess they are fairly low amp, but because the voltage is up to about 16, they have the ability to get the battery fully charged. I'm going to guess that the problem with my Battery Tender is it just never gets the voltage high enough for the battery to achieve a full charge
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I don't know where this info comes from.
My battery tender always holds 14.6 for 4 hrs, and does fully charge the batts.
2 of my shumacher maintainers holds voltage at 15,2 volts for 4 hrs, and does fully charge the batts.
My larger shumacher has finish voltage of over 16, before floating.
My PD does 14.4 for 4-5 hrs, then does 15+ during desulfate mode.
You don't need anymore than todays smart chargers to do 15 volts, that will makes batteries last 10 yrs.
