[Elecraft] KX3 and external batteries

[Andy Moorwood]

I have a similar issue, battery is at 16.7 when fully charged so I needed to partially discharge it before use.  Many of the programmable chargers have a discharge function ( check the current limit in this mode and then derate it, otherwise you may fry your charger).  Then when you charge set the voltage max to 15V.

There is still a lot of margin, reading through the manual I found a reference to 16V as the max voltage rating.

Certainly this approach decreases the Ah capacity of your battery since you are only partially charging it but repurposing is a cost effective.
73’s
Andy
K3CAQ 

> On Jun 23, 2019, at 3:05 AM, Victor Rosenthal 4X6GP <k2vco.vic at gmail.com> wrote:
> 
> If you decide to nerd out, all you need is a series diode.
> 
> 73,
> Victor, 4X6GP
> Rehovot, Israel
> Formerly K2VCO
> CWops no. 5
> http://www.qsl.net/k2vco/
>> On 23/06/2019 10:15, Howard Orridge via Elecraft wrote:
>> I have a bunch of Lipos from a different and less venerable hobby which can comfortably work between 13.2v and 15.4v, but have avoided use with the KX3 because of the 9v to 15v range. Has anyone risked a visit from Puff the Magic Dragon or should I nerd out and add a voltage limiter/ cut out circuit?
>> 73
>> Howard
>> 2E0HWO
>> Sent from my iPhone
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