I made a Batman astro mech. I thought to myself why would Batman need a mech, with guns no less. First thought was maybe since he is on the JLA he might want to help out with some brute force on some of there higher tier missions. Or maybe its for an older much grumpier Bruce Wayne from Kingdom Come that can't run along roof tops anymore. The batman is supposed to be just a symbol so maybe someone like Azrael has taken up the mantle.
batman 2 by
vwzealot, on Flickr
My Batman has 2 capes, because 2 capes is always better than one >.> Also a jet pack and life support systems. The helmet is part of an integrated hud system with the mech like F-35 helmets.
http://en.wikipedia.org/wiki/Helmet-mounted_displayIt allows him some limited control of the mech while outside of it. Things like auto targeting and fire control.
batmech 3 by
vwzealot, on Flickr
It has an anti gravity and particle shield generator on the back; better seen in the gallery. Its mostly to stop small pieces of space dust from ripping a hole in its hull in space. It also assists in scrubbing of friction from the atmosphere if a self reentry to earth is required. In emergency's the batman can super charge the shield to ward of heat rays or omega beams, but at great cost to its power banks.
Its sword is magic. Where did he get a magic sword? Maybe from some Amazonian's or the Wizard Shazam, the point is he is the "god gorram batman" so don't ask dumb questions. You might think that its made of kryptonite in case superman gets out of line. But why risk weakening one of your greatest allies by mistake. The supes is also weak to magic and so are a lot of omega level threats. This is much safer

batmech cockpit 2 by
vwzealot, on Flickr
The cockpit features a bi-valve design. The roof raises up and has an extendable arm with rope for the batman to use to climb out. Even though he has a jetpack, if he wants to keep using his mech its best not to blast out of there unless its an emergency

The front rotates forward and carries the controls with it. Also seen is small armory and power supply.