Charger voltage as it finishes the internal balance cycle rises to 14.6 volts.  
The K3 and KX3 seem happy then.

40 amp hours at 12-13 volts should last 4 hours key down.  I don't usually last 
that long.  But the charger QRN is about S2 so you could conduct tag chew QSOs 
while recharging.  

My approach is to have a backup ready.  YMMV
-- 
Marc. W8SDG
SOLI DEO GLORIA

> On Dec 21, 2015, at 3:37 PM, Juliean Galak <jga...@gmail.com> wrote:
> 
> Can one keep the battery on the charger and run the radio off the battery
> simultaneously?
> 
> I wonder how long I can run a K3s/100 off one of these batteries...
> 
> Juliean
> KD2JPF
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