Cuda 250 vs. 350

The 250 will display the voltage of the battery?


I've been going on 5 trips on the same charge with my 5 amp hour batt. and it is just nearing 11 volts.

Let me reword that to coincide with Walli's observation. 

Why would Lowrance/Eagle remove an option from one unit that is damn near the same unit as the other, just labeled differently.
Voltage would be such a simple item to have, why eliminate it when ya know it works?