Did I just get lucky? - Toyota 4Runner Forum

RobS10 · 08-24-2023, 10:25 AM

We have had a 1999 SR5 for 18 years and now own a 2022 4Runner ORP. We just gave our rarely driven '99 to our son who left the parking lights on and ran the battery down. I drove to it and pulled out my trusty heavy gauge jumpers I've used for 20 years and jumped it no problem, but read some pretty horrible things could have happened to our new rig and could have easily fried the computer system. Did I just get lucky because the old 4Runner battery wasn't that dead and started right away?

RedRunner_87 · 08-24-2023, 10:31 AM

I have had zero issues jumping cars with my 5th gen or my 5th gen getting jumped when my battery died.

Forgetful · 08-24-2023, 11:02 AM

Get a 50$ lithium jumper, you're playing with fire.

RobS10 · 08-24-2023, 11:24 AM

Quote:

Originally Posted by Forgetful

Get a 50$ lithium jumper, you're playing with fire.

Thought they were more like $200 for a decent one? We do have a lead acid jumper box, but it's kinda bulky to leave in the car all the time, not to mention remember to charge it up. Our '22 is still newish and don't anticipate needing a jump, but always like to be able to help others out. May not be worth to carry cables for someone else now :-(.

lewdog998 · 08-24-2023, 11:25 AM

I have jumped many vehicles with my 2020. No issues. Also the owners manual even gives instructions on how to jump the 4r should the battery be dead. While it does not give instructions on how to use the 4r to jump others, it does not state that you should not or give any warnings to do so. Given that the manual addresses jumpstarting..with no warnings against using the 4r as the "starter"...its probably safe to do so.

97BlackAckCL · 08-24-2023, 11:33 AM

You're just sending voltage to the other battery, don't see how that would cause issues, especially on something as tried and true as a 4Runner

RobS10 · 08-24-2023, 11:35 AM

Quote:

Originally Posted by lewdog998

I have jumped many vehicles with my 2020. No issues. Also the owners manual even gives instructions on how to jump the 4r should the battery be dead. While it does not give instructions on how to use the 4r to jump others, it does not state that you should not or give any warnings to do so. Given that the manual addresses jumpstarting..with no warnings against using the 4r as the "starter"...its probably safe to do so.

LOL! I should have gotten out our manual, good to know! I did watch a few videos and read a few websites that said the "starter", i.e. running vehicle, should not be running, but no explanation as to why...to much draw on the 4Runner's alternator by the other vehicle's dead battery?
Step 5 was interesting..."Open and close any of the doors of your vehicle with the engine switch off".

AZ Craig · 08-24-2023, 11:38 AM

Quote:

Originally Posted by RobS10

Thought they were more like $200 for a decent one? We do have a lead acid jumper box, but it's kinda bulky to leave in the car all the time, not to mention remember to charge it up. Our '22 is still newish and don't anticipate needing a jump, but always like to be able to help others out. May not be worth to carry cables for someone else now :-(.

Check out Amazon, you can get a decent one for around $50 to $100 and ditch your old lead acid battery jump box (I had one of those also and hated it).

I've used our Lithium jumper at least 3 or 4 times now as Arizona kills batteries. Never had an issue and always started car right up on first try. They're small enough to keep stashed in your trunk easily also.

RobS10 · 08-24-2023, 11:40 AM

Quote:

Originally Posted by AZ Craig

Check out Amazon, you can get a decent one for around $50 to $100 and ditch your old lead acid battery jump box (I had one of those also and hated it).

I've used our Lithium jumper at least 3 or 4 times now as Arizona kills batteries. Never had an issue and always started car right up on first try. They're small enough to keep stashed in your trunk easily also.

Form factor is perfect. How do they work on a fairly dead battery though, and how often do they need to be topped off?

Syr4RinNC · 08-24-2023, 11:46 AM

I think the big thing as mentioned is you dont want to go negative terminal to negative terminal. The battery thats dead shouldnt use the negative terminal and just use a nearby ground

fkheath · 08-24-2023, 12:11 PM

Quote:

Originally Posted by RobS10

Thought they were more like $200 for a decent one? We do have a lead acid jumper box, but it's kinda bulky to leave in the car all the time, not to mention remember to charge it up. Our '22 is still newish and don't anticipate needing a jump, but always like to be able to help others out. May not be worth to carry cables for someone else now :-(.

Got this a couple months back. $73. One of the highest consumer rated and one of the highest amp rating:
https://www.amazon.com/dp/B0BXP151N6...roduct_details

AZ Craig · 08-24-2023, 12:12 PM

Quote:

Originally Posted by RobS10

Form factor is perfect. How do they work on a fairly dead battery though, and how often do they need to be topped off?

I've experienced very little battery life loss with them sitting in my car sometimes for months between checking and/or using them. It's honestly amazed me that I think I've seen it hold charge (at least based on its indicators) for over a year.

In theory as long as you select one with sufficient cranking amps for your application, you should have no issues using it. I've jumped our 4Runner's 4.0L with it no issue (saved my ass on a road trip in South Dakota and let me just be able to drive over to an autoparts store and get a battery) and otherwise used it on a bunch of European cars with 2.0T engines.

Takes up less space than a full set of jumper cables also. Finding someone to jump you at a remote trail head in Arizona or Utah isn't easy either

.

fkheath · 08-24-2023, 12:17 PM

Quote:

Originally Posted by RobS10

Form factor is perfect. How do they work on a fairly dead battery though, and how often do they need to be topped off?

When you connect a jump pack, you leave it connected for a few minutes before you try starting the car with the dead battery. That way, the jump pack gets some charge to the dead battery and the dead battery can then supply some of the starting current needed.

Most jump packs have status lights you can check from time to time. It will tell you when you need to recharge. How often you need to recharge them depends on how much you use them and how long it has been since the last charge. I try to remember to charge mine every four or five months.

RobS10 · 08-24-2023, 12:21 PM

Quote:

Originally Posted by fkheath

Got this a couple months back. $73. One of the highest consumer rated and one of the highest amp rating:
Amazon.com

here's another one...guess these things are cheaper than I thought...
Amazon.com

RobS10 · 08-24-2023, 12:22 PM

Quote:

Originally Posted by fkheath

When you connect a jump pack, you leave it connected for a few minutes before you try starting the car with the dead battery. That way, the jump pack gets some charge to the dead battery and the dead battery can then supply some of the starting current needed.

Most jump packs have status lights you can check from time to time. It will tell you when you need to recharge. How often you need to recharge them depends on how much you use them and how long it has been since the last charge. I try to remember to charge mine every four or five months.

Thanks for the good info! Maybe set a Google Calendar reminder.

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