Largest Battery Size for 2003 4runner V-6

[TNFISHRMAN]

Does anyone know what the largest battery is that you can fit in the stock battery tray area? My son needs a new battery and I don't want to relocate it but would like to put the biggest battery I can fit in it. Any help appreciated!!

 

[montijo505]

I think I've read around if it's too big the alternator can't charge it. I'm running an Optima redtop but don't remember the group number, I'd have to check the battery tomorrow.

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[BagiMT]

Group 31 barely fits. Group 27 fits well with stock tray and mount and has almost the same capacity.

 

[TNFISHRMAN]

I think I've read around if it's too big the alternator can't charge it. I'm running an Optima redtop but don't remember the group number, I'd have to check the battery tomorrow.

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If you think about it and don't mind let me know. I want to put as large of capacity battery in as I can for my son.

 

[riceandpho]

group 31 fits, just need to extend the cables a little since the post is more in the middle.

27f fits, bigger than the 24f

24f fits

 

[randy88fj62]

I would focus on the quality of the battery. Look at AGM's. I love my intimidator glass mat battery.

 

[Bossman]

Need a new battery... but which one?

Battery sizes ... I just don't understand.

confused about battery threads

Battery suggestions

What battery do you run?

 

[Bossman]

Sizing chart from Toyota indicates a 2003 Toyota 4Runner V6 takes the stock 24F or optional 27F.

Depending on what your battery needs are (e.g., cold weather starts, running lots of electrical equipment) it would be advisable to stick with the stock size.

https://www.toyotapartsandservice.com/wp-content/uploads/2019/11/03_Batteries2019.pdf

 

[montijo505]

My redtop is a 35 after all, says Red35 on the sticker and if you look near the positive post says 35 there also. No issues with it. Don't remember quite how long I've had it, but it's been at least three years I'd say.

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[CarlosV]

Same set up.

Also Optima 35 with HKB fuse/diode, but only 1 year and 10K miles. Time will tell

 

[hinmo24t]

My redtop is a 35 after all, says Red35 on the sticker and if you look near the positive post says 35 there also. No issues with it. Don't remember quite how long I've had it, but it's been at least three years I'd say.

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i saw an install video or writeup where they say the redtops fit but the battery connections are tight. the ground is tight and the positive is stretched i remember them saying. did you notice that? they said you have to position the battery as far back and towards the edge for them to reach


if i dont just get a traditional 24 or 27 (i know toyota says 27f as option, but there are accunt of those sitting off the lip of the tray i believe) ill grab a redtop or x2 24 agm

 

[montijo505]

Also Optima 35 with HKB fuse/diode, but only 1 year and 10K miles. Time will tell

Why the diode? Just curious as I don't run one and zero problems.

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[montijo505]

i saw an install video or writeup where they say the redtops fit but the battery connections are tight. the ground is tight and the positive is stretched i remember them saying. did you notice that? they said you have to position the battery as far back and towards the edge for them to reach





if i dont just get a traditional 24 or 27 (i know toyota says 27f as option, but there are accunt of those sitting off the lip of the tray i believe) ill grab a redtop or x2 24 agm

It's been a while, but I don't remember the install being anything but straight forward.

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[hinmo24t]

Why the diode? Just curious as I don't run one and zero problems.

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i think they might be referring to a diode added to trick the alternator to charge stronger or more for the AGM battery specs. otherwise the most the stock alternator can charge is less than the AGM output, by like 20%

 

[montijo505]

i think they might be referring to a diode added to trick the alternator to charge stronger or more for the AGM battery specs. otherwise the most the stock alternator can charge is less than the AGM output, by like 20%

Yeah but the person I quoted is running same red top as I am. Just wondering why.

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[CarlosV]

Why the diode? Just curious as I don't run one and zero problems.

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I was getting low resting volts (around 12v ) and around 13.8v while on the road so added diode to trick alt sensor and now getting higher resting and charging volts (aprox 0.5 higher volt)

 

[CarlosV]

i saw an install video or writeup where they say the redtops fit but the battery connections are tight. the ground is tight and the positive is stretched i remember them saying. did you notice that? they said you have to position the battery as far back and towards the edge for them to reach

It will fit w/out stretching or changing anything. Yes you have to put it far back and towards edge as seen in pics.