It may be related to drawing current from the internal batteries when you don't use a higher voltage external supply -- vs. no current from them when they are not powering the rig.

73, Phil w7ox

On 3/13/14, 7:49 PM, Andrew Robertson wrote:
I have some NiMH batteries installed in my KX3, and while it is plugged into a 
power supply or fully charged 12v battery the rechargeable batteries report a 
voltage of 10.8v.  If I remove external power the KX3 reports internal battery 
voltage at 10.2v.  Is the KX3 trickle-charging the internal batteries when 
external power is applied, and if so what is the trickle charge rate?

Thanks.

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