It slides out the back after removing the back plate - the bitch is getting the wiring harness back in once you replace it.
Oh - there is a switch that Angel came out with in 2001 installed on it as well. https://tbqf.co/wp-content/uploads/20...LCD-Manual.pdf
Here is the manual.
Also - no one sells the battery any more - here is a mod to make one rechargeable. https://www.angelowners.com/showthrea...able-batteries