Originally Posted by lewdog998

this guy has tested everything...food for thought
Project Farm...he seems to be pretty thorough.

Which Car Battery is Best? Let's find out! - YouTube

Originally Posted by Humble Leader

project farm had done a really good video on portable jumpers. I almost bought one but didn't - old fashioned jumper cables just seem to work the best

not to sidetrack the thread - but yes project farm is a good source

Originally Posted by Ripper238

project farm is awesome! So detailed and scientific. Anything he tests out as best is a sure winner.

I got my Gooloo 4000a jump pack because it tested so well on project farm.

Originally Posted by Humble Leader

have you had to use it yet? I had a and I knew my battery was on its way out, so I let it die during an extreme cold over the course of 4 days. tried to start it at -32*C and the GB40 wouldn't even get a crank out of the engine. nothing at all. I was for once finally excited to have a dead battery since I knew I was going to replace it anyway when I had the chance. went to project farm after this to research and GB40 tested second worst on their list. go figure, so I returned it

The issue I think with some of these weaker portables is in extreme colds, when most people's batteries die and have no juice left. there's just not enough juice to get it going again from the portable chargers. autowit supercap2 is supposed to be good too. it doesn't work on lithium and uses capacitors which don't drain over time. called CAA, they were swamped and they didn't even show up. so I now have gauge 2 jumpers all the time with me

Originally Posted by Humble Leader

I'm skeptical about the AGM batteries. I know many people love them but I've read too many posts about them dying out early, way too early. they charge differently than a standard lead acid battery and can be finicky if the right voltage isn't given to them. Many people use a trickle charger with them. Newer cars can be programmed or detect AGM batteries and charge them accordingly, but I don't know about our 4runners, especially older years

I've had great success with OEM and have only ever put OEM in my 4runner and wife's lexus, minimum 650CCA. each one has lasted at least 5 years through canadian winters (wifes 2010 RX with 170k km is on it's second and my 2012 4runner is on it's third with 250k km, actually just replaced it last week)

if you don't have any significant power requirements beyond factory I don't see the need to change batteries. 5 years for a battery is respectable. of course, I know not everyone shares the same OEM battery love that I do

Originally Posted by Ripper238

I returned my GB40 too. But that was project farms fault. lol

Yes, i used it on a 7.3 diesel with a completely dead battery so I had to use the "power mode" and started no problem. Also jumped my 4Runner and a Ram 1500.

I agree, the cold is a problem and long term storage. Having the largest capacity is a big help, and warming a frozen jump pack even if its in your jacket for 5 minuets before jumping will do wonders.

I have to say the GooLoo has some serious CCA, people are surprised how fast it turns the engine.

Originally Posted by 1000MPH

Are you buying actual OEM batteries or are you just buying Toyota replacements?
Since I can’t get the Panasonic here I buy the Interstate cheap from Costco and plan on replacing at 4-5 years.

Originally Posted by danielmiao

I'm suspecting dealer replace battery before sell the car to me