Join Date: Apr 2004
Location: Decatur, IN
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I should have clarified. It's reccommended to charge at NO MORE THAN 10% of total rated cranking amps. The less charging amperage, the better I'd say.
But to answer your question, 10% of 875= 87.5 MAX.
I also haven't figured out the theory of being able to "overcharge" a battery. A battery would charge much in the same as a capacitor- when discharged, voltage is low, but will readily 'take on' current, hence a rapid rate of charge. As the battery charges up close to the battery charger's voltage, current would drop off exponentially, therefore have a much slower rate of charge. Finally, once a battery has reached the same voltage as the charger, in theory, current flow will cease.
However, I know this phenomenon does exist. My reasoning is that the battery's internal resistance is a cause of current flow even while the battery is fully charged, causing excess heat and 'gassing'. This is also the same reason that leaving your truck sit for months with the batteries disconnected from the truck (but connected to eachother) will cause them to drain.
1994 Ford F250 4x4: 7.3L IDI factory turbo, supercab longbed, E4OD *DEAD*. ZF5 swap,Dana 60 swap, GM 14 bolt rear w/ 4.10s, 4" exhaust from stock downpipe back to a 5" stack, IP maxed=1100 degrees max pulling uphill, "modified" wastegate=11psi max,99+ F450SD cab/chassis leaf springs in rear
2000 VW Jetta TDI = 48+mpg
Member of Indiana Air National Guard 122FW MXS