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wopachop's avatar
wopachop
Explorer
Apr 28, 2019

Whats normal voltage drop from a 4amp load? (210ah)

I have two brand new 6v from costco. I pulled 20amp hours out of them a week ago and then fully charged with an automotive battery tender. Today i put a 3.8a load on them and voltage is down at 12...
MrWizard's avatar
MrWizard
Moderator
Apr 28, 2019
i have a 200amphr AGM, This Morning i have warmed up several cups of coffee in the MW and heated my jimmy deans breakfast bowl in the MW, i am using this PC, battery status is 24 AmpHrs used, 88% SOC remaining, 6 amp draw , voltage 12.63v

your voltage
that is too much voltage drop

batteries were NOT fully recharged

tenders are designed to maintain a battery that is fully charged
NOT to recharge a battery that has been used
voltage from a tender is NOT high enough to fully charge "any battery"

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