Interesting point. I hunted down the data sheets for the most recent versions, 
and they are different. The specs give “internal impedance” after discharge to 
1.0 V, measured at 1000 Hz.

Eneloop (white) BK-3HCDE: Approx. 25mΩ
Eneloop Pro (black) BK-3HCDE: Approx. 40mΩ

wunder
Walter Underwood
[email protected]
http://observer.wunderwood.org/  (my blog)


> On Jan 15, 2017, at 6:16 AM, Chip Stratton <[email protected]> wrote:
> 
> I would just add that in my experience, the standard Eneloops (white, 2000
> mAh)  are more suitable for the KX3 than the Eneloop Pro (black, 2500 mAh).
> The larger capacity Pro cells seem to have a higher internal resistance
> which results in a much larger voltage sag on higher current draws, e.g.
> transmit. This becomes even more apparent as the cell ages.
> 
> Chip
> AE5KA
> 
> On Sun, Jan 15, 2017 at 8:20 AM, Keith Onishi <[email protected]> wrote:
> 
>> Panasonic Eneloop works fine to me with my KX3.
>> 
>> 73 de JH3SIF, Keith
>> 
>>> 2017/01/15 16:49、Eddy Avila <[email protected]> のメール:
>>> 
>>> Hi Elecraft gang, any recommendations for Nimh batteries for my new KX3?
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