The battery is a yellow rectangular module.  Info about it is on the wiki:
    http://www.tentecwiki.org/doku.php?id=565battreplace
The battery is visible in the Orion 565 Version 2 Logic mod.  It is in photos 
6, 
7 and 8 on the logic board.
     http://www.tentec.com/files/Orion%20V2%20Logic%20Mod.pdf
 73,
Rick
VE7TK
Website: http://www.ve7tk.com
----- Original Message -----  From: "Martin Sole" <hs0zed@csloxinfo.com> To: 
"'N4PY2'" <n4py2@earthlink.net>; "'Discussion of Ten-Tec Equipment'"  
<tentec@contesting.com> Sent: Saturday, October 16, 2010 10:06 AM Subject: RE: 
[TenTec] Orion resets at every power up   > There's a battery? Who'd have 
thought. I know it says battery failure when > doing a RAM clear but had 
assumed 
(ha) it was just a way of saying that  > the > process had taken place. Maybe 
standard device text. > > So where is the battery? Not on the CPU/DSP board. 
What is it's function? > Which schematic is it on? Coin cell? What expected 
life? Hopefully  > changing > requires no special procedure. Who knows? 
Questions questions??!! > > Thanks > Martin, HS0ZED >
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