Do Head Units Have Batteries These Days?

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electricduck

Member - Posts: 6

Joined: February 03, 2014

Location: Washington, United States

Posted: March 03, 2023 at 1:20 PM / IP Logged

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.

dennis

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southsidesmoka

Member - Posts: 22

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Joined: June 26, 2004

Location: South Carolina, United States

Posted: March 09, 2023 at 10:43 PM / IP Logged

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.

Murphy and his damned Law keep me quite busy...

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Custom_Jim

Copper - Posts: 208

Joined: November 28, 2003

Location: Missouri, United States

Posted: March 27, 2023 at 5:28 PM / IP Logged

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

1968 Chevy II Nova Garage Find 2012

1973 Nova Custom

1974 Spirit of America Nova

1973 Nova Pro-Street

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