Does the 'temporary memory'... - Alfa Romeo Bulletin Board & Forums

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Old 11-20-2011, 07:15 PM
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Does the 'temporary memory'...

...on a receiver/head unit always require power? I assume that it does. And going on that basis, if someone needs to remove the battery, will attaching the cables from a battery charger to the +/- cables suffice to keep the memory, umm, memorizing? I'll add that my charger is ancient but works well for basic charging.

Could it do damage, especially to a new receiver with add-ons which I assume will have numerous specific preference settings?

Actually I'm planning on getting a Harbor Freight battery jump starter which would probably work better for this.

To make it clear, the receiver would not be turned on.

Comments?
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Old 11-20-2011, 07:44 PM
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Quote:
Originally Posted by Biba69 View Post
...on a receiver/head unit always require power? I assume that it does. And going on that basis, if someone needs to remove the battery, will attaching the cables from a battery charger to the +/- cables suffice to keep the memory, umm, memorizing? I'll add that my charger is ancient but works well for basic charging.

Could it do damage, especially to a new receiver with add-ons which I assume will have numerous specific preference settings?

Actually I'm planning on getting a Harbor Freight battery jump starter which would probably work better for this.

To make it clear, the receiver would not be turned on.

Comments?
If you don't want to lose what's stored there, some do, some don't. If you are worried about such things as security codes and what not, then yes, you need to keep power to the unit.

A charger should work fine. Just be careful when you disconnect the battery to not let the POS lead touch the chassis.

bs
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Old 11-20-2011, 08:21 PM
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Mmm...I'm not sure if I'd use a charger for that application. I don't think a modern charger would even work: they base the charge rate off battery voltage, so if they don't sense a battery there they won't put out any volts.

They sell small battery powered devices that plug into the lighter socket to maintain the battery during service. Here's one for $8:

http://www.amazon.com/Computer-Memor.../dp/B000J4HHVM
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Old 09-26-2013, 03:23 PM
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Old thread, but you can just alligator clip a 9V battery to the battery terminals, watch the polarity. That is enough to retain the memory while changing the car's battery.
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Old 05-10-2014, 06:40 PM
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Has anyone tried battery backup system that car alarm systems use? Basically its a rechargeable battery that keeps security system on in case thief disconnects terminals from car's battery. I am thinking about using this for car's stereo unswitched power and maybe for a gps tracking module... Any ideas?

https://www.google.com/search?q=back...battery+system
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