[Elecraft] FS 12v 5ah gel cells

[Niel Skousen]

Thanks very much for the nice clear explanations for the whole group ...

FWIW they are CSB, Long, and BB Battery( all APC standard vendors) -  
the majority are CSB.

Niel


On Jul 30, 2010, at 8:38 AM, Lew Phelps K6LMP wrote:

> This appears to be a very "standard form factor" product; you can  
> find batteries with exactly the same physical and electrical specs  
> online from a dozen or more different manufacturers. It is a  
> standard battery for use in UPS systems.
>
> While I don't know what brand Neil is providing, I found a spec  
> sheet for one manufacturer's similar product, which I have posted to  
> my web site in a folder where anyone can download it, at https://files.me.com/lewphelps/mxvahl 
> . It's a 483kB PDF file.
>
> What the power curves show is that it will run for just under 4  
> hours at a draw of 1 amp  before it drops to 11.0 volts, which means  
> you could run a K3 in receive only on one battery for that time  
> (nominal 0.9 amp RX draw with no sub receiver).  With a draw of 4  
> amps (TX nominal for K-10 is 3 to 4 amps) the battery drops to 12.0  
> volts in about 30 minutes (eyeball extrapolation of curves; use with  
> caution). I think a reasonable way to think about battery life would  
> be to run them in parallel but assume one battery is providing RX  
> current and the other TX current; hence, you with a pair of  
> batteries in parallel you could receive for 4 hours and transmit for  
> half an hour before you dropped below 11.5 volts.
>
> Each battery weighs 4.19 lbs. and measures 4.17" height (excluding  
> connecting tabs) x 3.98 x 3.54 inches. These batteries are too big  
> to put inside either a K2 or K3. (The "stock" K2 internal battery  
> has 2.9 ah capacity.) If one were to build an external power supply  
> box roughly the size of a K3 case, it could contain six batteries  
> and the charger circuit, and would weigh about 28 lbs. Assuming a  
> 20% transmit duty cycle, this "six pack" would keep a K3 running for  
> about 8 hours.  YMMV.
>
> Lew K6LMP
>
>
>
>
>
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