9V Battery Saver
 

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Is a 9V battery “memory saver”
necessary then replacing a battery or replacing battery terminal ends.

I know the clock needs resetting. How about the radio station presets?Does the security system need reprogramming?
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Re: 9V Battery Saver
 

Fairy certain the OEM radio's pre-sets that you saved go away if you lose the battery connection.
Not sure about the security reprogramming. I haven't used it in so long.