WARNING: Off topic question.

My '86 300E's radio shuts down if the battery gets disconnected or goes out. It requires a dealer tool to reset the codes. Is there a way to avoid losing radio when installing a new battery?

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62 220sb
67 250S
72 280SE 4.5
74 280C
77 300D
82 240D
85 190E 2.3
86 300E RIP 12/28/09
85 300SD
92 300D 2.5
00 E320 Current
Over 1,000,000 miles in Benzes, Since66

....and a whole passel of BMW 2002 and Tii