[Elecraft] K3 13.8 VDC power, battery supplies

[David Cutter]

Batteries are sensitive to their electrolyte temperature, some more than 
others.  If it is tempting to put batteries outside the shack for any 
reason, take care of the temperature extremes they may experience in terms 
of charge voltage etc.  Inside a shack that is nice for us is also good for 
the battery.  See:
http://batteryuniversity.com/learn/article/charging_at_high_and_low_temperatures

73

David
G3UNA

> Concerns about outgassing notwithstanding, I've never used anything more 
> than the voltage regulator on the power supply to limit the charge, and 
> I've always used ordinary deep cycle batteries. The key is to limit that 
> voltage to what the battery expects, and to limit the charging current to 
> what the battery will take as a "trickle" once it's reached full charge. 
> Those are not difficult to do if you simply monitor battery voltage and 
> charge current.
>
> 73, Jim K9YC