Well be concerned no longer...
The Xeo and Xen use an ER14335M battery. Since they vary in capacity based on the manufacturer, we can only specify the approximate dive time with the Liquivision recommended battery which we will ship to dealers. With the Liquivision recommended ER14335M the Xeo gets about 50 hours of dive time in trimix full color mode at medium brightness. If you switch to green text at low brightness that goes over 90 hours. That's assuming that you do all the diving within a month or two after putting the battery in. If you put in a fresh battery and leave it in standby for a year, and then go diving, the effective dive hours will be less.
Those are dive times from initial internal tests. Those are not necessarily the numbers we will claim, we have not determined what we will claim yet because it makes a huge difference what colors the user chooses to use. White, for example, burns three times as much power as green. Since you can configure the color of every item on the display, the power drain can vary dramatically.
-Doug
Liquivision Marketing & Sales Manager