Battery replacement/ keep settings

So when I replace the battery in my wife's Subaru ( 2017 ) all the radio
and clock settings and all that jazz gets waxed. Real pain in the azz to
reset that back up.

As I recall, and my mind is weak, when I replaced the battery in my 2021
Tacoma it didn't lose anything. Is there like a little battery that keeps that
'stuff' in memory for a few minutes?

I'll sniff around for a OBDII or 12v device to keep the wife's settings but do
I need to worry about the Tacoma?

I buy 3-year batteries (NeverStart) and swap 'em every 2 years.
If you live in Arizona you'll understand LOL...

 

Pretty sure I get wiped everytime. Have to do a mini obstacle to get both front/rear cam to work, pretty sure the trans relearns shifting parameters and mpg resets and relearns driving habits. That’s just what I’ve noticed, other stuff I guess I hadn’t paid to much attention to

 

Hook up a battery tender while swapping the leads?

 

You can plug in another 12v source to keep them, if they are stored in volatile memory. Most stereos wipe when no power, so hooking up another 12v source will work

 

$10 OBD car Memory Saver obdii Connector Battery Change ECU Protection Replacement 12V

https://www.amazon.com/dp/B0DWT7JTPZ

I use one of these whenever swapping batteries. I use a small powersport battery to connect the clamps to.

 

I've swapped my battery twice since 2018 and I don't "remember" losing anything.
I just swapped the wife's 5th gen 4Runner HID system and battery a week ago, and I know I didn't lose anything..

¯\_(ツ)_/¯

 

When swapping the battery, tie a little something to the end of the dinky 10mm wrench
and tie off the other end to some 'part' on the engine. That way if it inadvertently slips
out of your hands and into the unknown of the engine bay you can retrieve it.

Ask me how I know...

 

Let me make a case unhooking the battery and let everything reset. Should make little electrical gremlins go away.

 

Interesting take..

 

Jumper cables on the battery cables take your time.

 

Same here. 2020 replaced battery a few weeks ago and everything back to the way it was. Just swap, I think you're OK.

 

I always use a memory saver to be safe. They’re available from most local parts stores or Amazon etc.

 

Swapped my '21 battery a year ago, I did it quickly and the truck didnt lose anything