Hi folks. Wondering if anyone here is familiar with design of older 12v car type portable chargers? I have a RN Industries one that will run small motors and reads 15V across the clamps but it does 'nothing' when connected to a battery. The voltage across the clamps drops to whatever the battery itself is once connected. And no reading on the ammeter on the charger. (the ammeter does move properly when running motors.) Any ideas why it runs the motors but doesn't charge a battery? thanks.
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