Well, that’s one way to do it. On my KX3 I simply turn the VFO B knob until the 
display is showing PS voltage, or BT voltage, whichever I desire.

73,

Arlen - AA7F

> On Jun 5, 2015, at 8:40 AM, Don Wilhelm <[email protected]> wrote:
> 
> Gareth,
> 
> The internal battery voltage does not increase.  You have to understand what 
> the VFO voltage reading is telling you.  It reads the highest supply voltage, 
> not always the internal battery voltage.
> 
> If you are looking at the VFO B voltage display, you will see the highest 
> supply voltage applied.  So, if your external supply is at a higher voltage 
> than the internal batteries, that voltage is what you will read.  If you want 
> to see the voltage of the internal batteries only, you will need to 
> disconnect the external supply.
> 
> 73,
> Don W3FPR
> 
> On 6/5/2015 11:18 AM, Gareth - M5KVK wrote:
>> Seems like there's a bit of a battery theme at the moment.
>> 
>> I ahave the KXBC3 intalled with some Eneloop batteries. I notice that when
>> I plug in the external PSU, the internal battery level increases: even
>> though I'm not charging.
>> 
>> Does this imply that just having the external PSU connected causes some
>> charge to go into the internal batteries, or does one always have to use
>> the internal charger?
>> 
>> 
> 
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