[Elecraft] Experience with Energizer Lithium AA Batteries?

[Walter Underwood]

Thanks. Looking at the data sheets, the Energizer lithium's internal resistance is "120 to 240 milliohms (depending on method)” and for the Eneloop Pro, the internal impedance is “Approx. 25 mΩ (at 1 kHz)”. Not really the same spec, but the ESR is probably similar to those numbers.

Also, the max discharge for the lithium AA cells is 2.5 amps continuous or 4.0 amps pulse (2 sec on / 8 sec off), so that should be fine for running the KX3.
 
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On May 11, 2023, at 5:25 PM, Matthew Cook <vk5zm at bistre.net> wrote:
> 
> Walter,
> 
> Like all primary cells they do have some ESR which is a little higher than other secondary cell chemistries.   
> 
> Like Julia I have pushed these cells towards 1A/cell at -30 celsius and achieved reasonable results and the load curve is very flat.
> 
> The additional terminal voltage is good for overcoming some of the ESR problems at high load, but if the final amplifier is prone to distortion or AM modulation due to voltage drop then things get a little more difficult.
> 
> The proof is in the pudding, so I'd simply purchase a set, place your multimeter across the cells (maybe use a RF choke if TX not into a dummy load) and watch the terminal voltage when you TX with your desired modulation, you'll quickly know if you have a problem.   
> 
> If your experiment is unsuccessful the E2 energisers go forever in your remote controls and wireless mouses, they will certainly not be wasted !
> 
> 73
>  
> Matthew
> VK5ZM
> 
> 
> On Fri, 12 May 2023 at 02:15, Walter Underwood <wunder at wunderwood.org <mailto:wunder at wunderwood.org>> wrote:
>> Thanks, that is actually on the data sheet, now that I look.
>> 
>> https://data.energizer.com/pdfs/l91.pdf
>> 
>> My biggest concern is whether they hold up under a 2+ A current draw. The data sheet stops at 1 A.
>> 
>> wunder
>> K6WRU
>> Walter Underwood
>> CM87wj
>> http://observer.wunderwood.org/ (my blog)
>> 
>> > On May 9, 2023, at 9:10 PM, Matthew Cook <vk5zm at bistre.net <mailto:vk5zm at bistre.net>> wrote:
>> > 
>> > Walter,
>> > 
>> > These cells have a slightly higher terminal voltage 1.82 c.f 1.65 (when full) from your normal heavy duty alkaline battery... flat is still the same at 1.0V under load discharge curve is what you'd expect under moderate/high loads.   
>> > 
>> > We regularly fly these (and only these cells) in our high altitude balloon experiments at reasonable currents (> 200mA), so at temperatures below zero celsius (+32F) they still have significant usable capacity.   They will certainly give your Enerloops a run for their money.
>> > 
>> > 73
>> > 
>> > Matthew
>> > VK5ZM
>> > 
>> > 
>> > On Tue, 9 May 2023 at 06:04, Walter Underwood <wunder at wunderwood.org <mailto:wunder at wunderwood.org> <mailto:wunder at wunderwood.org <mailto:wunder at wunderwood.org>>> wrote:
>> >> I’m considering taking Energizer Ultimate Lithium AA batteries (non-rechargeable) in my KX3 on a backpacking trip. They are half the weight of Eneloop Pro and have about 40% more Watt-hours of energy.
>> >> 
>> >> Anybody tried these? How did they work?
>> >> 
>> >> wunder
>> >> K6WRU
>> >> Walter Underwood
>> >> CM87wj
>> >> http://observer.wunderwood.org/ (my blog)
>> >> 
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