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Old 06-20-2010, 01:59 AM   #3 (permalink)
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What you have drawn is a 70mA current sink. If you place that in series with the battery then charge current will be limited to 70mA which seems a bit low.

If you are using a conventional power supply as a battery charger then you want to set the output voltage just above the battery voltage. Then raise the power supply voltage while monitoring the current (to stay out of the protective hiccup mode). Come back every hour or so to raise the voltage in order to maintain charge current. Stop raising the voltage at 13.8V or so.
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