Battery change memory savers, do I need it? - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Lim · 04-30-2020, 10:59 AM

For short term memory lose this device usually helps:

ls1ac · 04-30-2020, 11:33 AM

Sorry I was no help.

I was just explaining the concept. I got a battery holder from radio shack that held 8 AA batteries. I then soldered a cigarette plug to the battery pack. Then plug it in.

Any 12v battery will do.
A company used to have a small unit with a 9v battery but todays cars need 12v to hold memory. I am sure they are on the market but mine was very inexpensive and easy to put together.

Tcoat · 04-30-2020, 11:43 AM

Quote:

Originally Posted by ls1ac

Sorry I was no help.

I was just explaining the concept. I got a battery holder from radio shack that held 8 AA batteries. I then soldered a cigarette plug to the battery pack. Then plug it in.

Any 12v battery will do.
A company used to have a small unit with a 9v battery but todays cars need 12v to hold memory. I am sure they are on the market but mine was very inexpensive and easy to put together.

The sockets on these cars are switched anyway. When you shut the car off there would be no power going to anything. You would have to have the key on or at least set to accessories while removing the battery for anything to maintain power up.

ls1ac · 04-30-2020, 11:45 AM

I would not recommend a battery charger for two reasons: one, most new chargers will not charge a dead battery. this is because they will ramp up the charge voltage to test for a recharge rate and shut down if no battery is found to be chargeable. The peak voltage can be quite high. The out put on the new type of charger will shut off . Two, the older chargers will put out voltage but it is usually full wave rectified and with out the battery acting as a very large capacitor it is 120 cycle AC. and the voltage peaks can be quite high.

ls1ac · 04-30-2020, 11:50 AM

I think you may be correct Tcoat, I did half put in a non-switched plug for other devices. I guess you could put alligator clips on instead of a plug and clip to the battery leads.

edit: My truck and my wife's car have always hot plugs.

LimitedSlip · 04-30-2020, 03:28 PM

If you are of a mind to maintain vehicle settings during a battery swap, any other healthy 12 volt battery you might have (lawn mower, motorcycle, fish locator, trolling motor, etc.) could be temporarily connected to vehicle ground and the positive battery cable end with lightweight alligator clip jumpers. It doesn't require much for the short duration and minimal current draw. If you are of a mind to . . .

Ernest72 · 04-30-2020, 06:24 PM

Personally on my 04 WRX, I clean my MAF and reset my ECU with every oil change or at least once a year. I swear by my buttdyno that the car drives better afterwards. Try to do the same on the BRZ but I put more miles on so maybe once a year.

juanlien · 05-03-2020, 03:08 PM

Quote:

Originally Posted by Lim

I swapped it yesterday on FRS 2016.
Radio (stock FRS Pioneer unit) preset all preserved, BT, call contacts etc.
I let it idle for a few minutes, and I have not notice any issues when driving.

On my Legacy after battery was disconnected for few days it took like 10-15 minutes before it stopped stalling on a shift due idle dropping to much.

On FRS I only lost clock time, and custom setting for dash info (Rev light limit ...)

nice

dnieves · 05-07-2020, 09:49 PM

Quote:

Originally Posted by Lim

I swapped it yesterday on FRS 2016.
Radio (stock FRS Pioneer unit) preset all preserved, BT, call contacts etc.
I let it idle for a few minutes, and I have not notice any issues when driving.

On my Legacy after battery was disconnected for few days it took like 10-15 minutes before it stopped stalling on a shift due idle dropping to much.

On FRS I only lost clock time, and custom setting for dash info (Rev light limit ...)

Same here with my 2013's OEM headunit, you only need to set the clock, re-enable the gear/upshift display, and rev limiter setting then you're set.

Ernest72 · 05-08-2020, 08:45 AM

Changed my battery yesterday, somehow all presets and clock in my aftermarket HU were fine. Pioneer 2550nex.

Tcoat · 05-08-2020, 09:27 AM

Quote:

Originally Posted by Ernest72

Changed my battery yesterday, somehow all presets and clock in my aftermarket HU were fine. Pioneer 2550nex.

It isn't a surprise. Most HUs retain all of the presets. It isn't like they are still powered when you shut the car off.

Yoshoobaroo · 05-08-2020, 11:04 AM

Quote:

Originally Posted by Tcoat

It isn't a surprise. Most HUs retain all of the presets. It isn't like they are still powered when you shut the car off.

Most aftermarket units have an always on 12V and an ignition switched 12V. The wire harness in almost all cars still have both. It’s only fairly recent that most radios actually retain information after a battery swap, it’s probably only been 10 years or so.

Tcoat · 05-08-2020, 11:18 AM

Quote:

Originally Posted by Yoshoobaroo

Most aftermarket units have an always on 12V and an ignition switched 12V. The wire harness in almost all cars still have both. It’s only fairly recent that most radios actually retain information after a battery swap, it’s probably only been 10 years or so.

Ahhhh. Yes I should really not speak on the subject of HUs since I am actually pretty ill informed on them.

Never lost the presets in most of my old cars!

Sapphireho · 05-08-2020, 01:46 PM

Quote:

Originally Posted by Tcoat

Never lost the presets in most of my old cars!

Just buttons and knobs.

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04-30-2020, 10:59 AM	#15
Lim Member Join Date: Sep 2018 Drives: Scion FRS 2016 Location: Toronto Posts: 30 Thanks: 5 Thanked 19 Times in 12 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	For short term memory lose this device usually helps:

04-30-2020, 03:28 PM	#20
LimitedSlip Senior Citizen Member Join Date: Jul 2018 Drives: Then-1977 Celica GT Now-2017 860SE Location: In A Galaxy Far Far Away Posts: 393 Thanks: 145 Thanked 385 Times in 201 Posts Mentioned: 12 Post(s) Tagged: 1 Thread(s)	If you are of a mind to maintain vehicle settings during a battery swap, any other healthy 12 volt battery you might have (lawn mower, motorcycle, fish locator, trolling motor, etc.) could be temporarily connected to vehicle ground and the positive battery cable end with lightweight alligator clip jumpers. It doesn't require much for the short duration and minimal current draw. If you are of a mind to . . .

04-30-2020, 06:24 PM	#21
Ernest72 Senior Member Join Date: Jul 2016 Drives: 16 Silver BRZ, 04 Silver WRX wagon Location: Rockland county, NY Posts: 1,411 Thanks: 182 Thanked 768 Times in 439 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Personally on my 04 WRX, I clean my MAF and reset my ECU with every oil change or at least once a year. I swear by my buttdyno that the car drives better afterwards. Try to do the same on the BRZ but I put more miles on so maybe once a year.

05-08-2020, 08:45 AM	#24
Ernest72 Senior Member Join Date: Jul 2016 Drives: 16 Silver BRZ, 04 Silver WRX wagon Location: Rockland county, NY Posts: 1,411 Thanks: 182 Thanked 768 Times in 439 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Changed my battery yesterday, somehow all presets and clock in my aftermarket HU were fine. Pioneer 2550nex.

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