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ltc3305 balancing current too low


I have ltc3305 battery balancing circuit using two series batteries and an aux battery.  All batteries are 9 A.H types. Circuit balances the batteries however balancing current is about 20-30 mA eventhough series battery voltages are about 13 and 12.5 V and aux 12.5V. I expect a much bigger balancing current. Any potential reasons for this situation? I am using a .15 ohm ptc resistor.


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