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battery advice

looked in diy and maintenance sections without any luck.so ,i want to replace my almost new group 35 battery with a new agm type battery.the question is this. how long

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Old 02-03-2019, 04:00 PM   #1 (permalink)
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looked in diy and maintenance sections without any luck.so ,i want to replace my almost new group 35 battery with a new agm type battery.the question is this. how long do i have to remove the old and install the new without possibly losing data or settings on the computer or other memory devices? also any advice as to how best do this would be appreciated . thanks to all. i looked at the service manual and think i have the removal process ok but there is always great info available here thanks
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Old 02-03-2019, 04:17 PM   #2 (permalink)
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I'm not sure exactly what settings/data your referencing. Even just a second and the radio presets along with the power window settings are gone. Fairly certain ECU learning/trim data is also gone (this isn't a bad thing) as soon as you disconnect the battery.

If what you're really worried about is losing a tune, don't. As evidence, I've had the battery disconnected for days and weeks without problems. In fact my car has been without a connected battery for the last month and a half due to periodic work I've been doing to it. I have no doubt once I get it back together it will fire right up once I get the new PC680 battery installed.
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Old 02-03-2019, 05:16 PM   #3 (permalink)
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Originally Posted by hotprops View Post
looked in diy and maintenance sections without any luck.so ,i want to replace my almost new group 35 battery with a new agm type battery.the question is this. how long do i have to remove the old and install the new without possibly losing data or settings on the computer or other memory devices? also any advice as to how best do this would be appreciated . thanks to all. i looked at the service manual and think i have the removal process ok but there is always great info available here thanks
Never used one; but there’s a plug that puts 12v into your cigarette/usb port & backfeeds power for that reason.
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Old 02-03-2019, 05:48 PM   #4 (permalink)
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This style plugs into diagnostic port & clips to an external battery/ some are made to use a plug in 9V dc battery & hold memory.
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Old 02-03-2019, 05:54 PM   #5 (permalink)
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hotprops,

Take the worry out of losing anything by hooking up a booster battery pack to the battery leads before you remove them from your battery. That way there'll be 12 volts to any memory until you hook up the new battery.

Be sure to keep those leads away from anything metal that might cause a short circuit.
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Old 02-04-2019, 07:51 AM   #6 (permalink)
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The only thing you lose is the maintenance interval stuff, clock, window auto up/down, and maybe the trip mileage and radio presets. A loss of power even for a few seconds will reset that stuff. But engine tunes and important stuff is all stored even with no power for months if not years.

You could buy something or spend an hour rig up some wires to keep power while you do the replacement but it's completely unnecessary because a pencil and a piece of paper with and about 10min could record and reprogram all that stuff.
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Old 02-04-2019, 09:10 AM   #7 (permalink)
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So far, everybody is right. You can hookup alternate power ...

or just reset a few things when you're done. Window reset takes about 30 seconds. Resetting radio presets shouldn't take long. The ECM's adaptive tuning params will be lost but will be relearned in a few minutes; any custom tune will still be there.

Personally, hooking up alt power is more trouble than resetting a few thing. YMMV.
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Old 02-04-2019, 12:25 PM   #8 (permalink)
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I’ve tried one of those memory holding cables on the Z. Didn’t work. Just put in a new Bosch Platinum AGM battery and reset your radio. Our car only holds 6 stations...
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Old 02-04-2019, 01:29 PM   #9 (permalink)
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I’ve tried one of those memory holding cables on the Z. Didn’t work. Just put in a new Bosch Platinum AGM battery and reset your radio. Our car only holds 6 stations...
The memory retention things that plug into the cigarette lighter won't work on our cars, the ignition has to be on in order for that outlet to be active, in fact, 95% of Honda, Toyota & Nissan's are like this. External power applied to the OBDII port will allow the ECM to retain all settings. I did this when I swapped the battery in my 2012 and didn't lose anything.
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Old 02-04-2019, 04:28 PM   #10 (permalink)
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The memory retention things that plug into the cigarette lighter won't work on our cars, the ignition has to be on in order for that outlet to be active, in fact, 95% of Honda, Toyota & Nissan's are like this. External power applied to the OBDII port will allow the ECM to retain all settings. I did this when I swapped the battery in my 2012 and didn't lose anything.
Correct. I have one for ODB to a cig lighter, and plug it into a power pack, or nearby vehicle. with the 5 vehicles we own, its a huge time saver as opposed to trying to remember what I need to reset in each one, let alone the steps to do so. (2 Nissans, an Audi, a Subaru, and a Chevy)
I think I paid $25 for it. Would have paid double that for the time I save.
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Old 02-05-2019, 12:31 AM   #11 (permalink)
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not a big deal at all... it takes 5 min. to reset everything.

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The only thing you lose is the maintenance interval stuff, clock, window auto up/down, and maybe the trip mileage and radio presets. A loss of power even for a few seconds will reset that stuff. But engine tunes and important stuff is all stored even with no power for months if not years.
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Old 02-05-2019, 10:11 AM   #12 (permalink)
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If you open the doors and leave them open while you replace the battery you won't have to worry about resetting the windows. That is the only thing that I would consider a pain.
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Old 02-06-2019, 08:20 AM   #13 (permalink)
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thank you all for your suggestions what a great place. still undecided and in no rush as oem battery is still good .i only want the agm as the z is not used as much as it should be. any other battery change tips would be welcome . is the Bosch agm a favorite here?
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Old 02-07-2019, 12:26 AM   #14 (permalink)
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Not sure why you want to replace an 'almost new' with an AGM battery. I would just hook it up to a battery tender if it is not driven much.

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looked in diy and maintenance sections without any luck.so ,i want to replace my almost new group 35 battery with a new agm type battery.the question is this. how long do i have to remove the old and install the new without possibly losing data or settings on the computer or other memory devices? also any advice as to how best do this would be appreciated . thanks to all. i looked at the service manual and think i have the removal process ok but there is always great info available here thanks
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Old 02-07-2019, 12:46 AM   #15 (permalink)
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agm batteries play nice in cars,aircraft. bikes that are not used much .fast charge ,low loss and no leakage/damage, as they are sealed
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