The elite 4x requires a minim of 10 volts and the battery you are looking at has 4 cells. This mean that each cell must put out at least 2.5 volts or the unit will not work well.   Looking at the top discharge curve for one Li Ion cell you will have 100% of the charge used when the battery is down to 2.5 Volts per cell.
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The battery you suggested has 10.4 Amp Hours divides that by the draw from the elite 4x.   
10.4 Amp Hours/.2Amps = 52 Hours.   
That battery has “Built-in IC chip will prevent battery pack from over charge and over discharge and prolongs battery life”.  I do not know if that requires a smart charger or not. If those batteries are over charged it will destroy them.