Red Wave Radio

The memory on my DJ580 began to die every time I turned the radio off, so I
shipped it off to Alinco and got a $150 estimate, so I politely asked them to
ship it right back..

They verified it is a dead lithium battery on the CPU board, and I would like
some ideas on the best way to replace this battery.  The technical manual was
$20 so unless I absolutely need it I'm not going to order it.

Any ideas or what not I'd appreciate it..