Do Head Units Have Batteries These Days?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=147611
Printed Date: April 18, 2024 at 11:43 PM
Topic: Do Head Units Have Batteries These Days?
Posted By: electricduck
Subject: Do Head Units Have Batteries These Days?
Date Posted: March 03, 2023 at 1:20 PM
I just purchased a Kenwood DPX594BT to replace the factory head unit in a car. It's been over a decade since I did my last head unit install and am wondering if modern head units have a built-in lithium or whatever battery in them in order to maintain various settings and the station memory when a vehicle's battery is disconnected.
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DENNIS
Replies:
Posted By: southsidesmoka
Date Posted: March 09, 2023 at 10:43 PM
I have yet to come across a head unit that can retain memory and settings via a built-in battery when totally disconnected from the cconstant power source. I've been "in the industry" off and on since the 1990's. I can't say I've seen it all, but I've installed a few head units here and there. The closest thing I have seen is a settings restore feature on Sony Bluetooth-enabled headunits that restores the head unit's settings when connected to a smart phone with their Sony Music Center software installed.
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Murphy and his damned Law keep me quite busy...
Posted By: Custom_Jim
Date Posted: March 27, 2023 at 5:28 PM
Many years back, Alpine had full chassis pull out radio's that did have a battery in them to retain the presets. Today, if the radio is fixed or even a removable face style, there will be a memory wire hookup for it and no battery inside of them. Some "might" retain some length of memory if totally disconnected but it may be due to a built up charge in a capacitor inside the unit.
Jim
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1968 Chevy II Nova Garage Find 2012
1973 Nova Custom
1974 Spirit of America Nova
1973 Nova Pro-Street
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