Wow that's a significant change. It's better for your electronics too to stay above 12v. Very nice ride. I didn't know you had the Subaru. I've been watching your videos for a while and just wanna say thanks for all your videos!

Glad to see the Subie back, I haven’t seen it in a while. I thought you sold it but I’m glad to see it’s still around. Looking forward to more build videos. 😃😃👍👍

I think a majority of your problems was that ground cable. You still have that old battery charge it back up throw it in there and see what it does now. I'd be interested to know what an apples to apples comparison actually is. But for that you'd actually need another brand new lead acid battery to compare it to.

Your guage is fine. The reason that the voltage drops below 12 is because you had all the lights on with the engine off

Nice I'm glade you fixed your electrical💯

Another great video. Some don't think that .4 - .5 voltage gain is not worth the money when you compare to a new factory style one. To me a gain of .4 to .5 volts is a good gain when you look at it from a radio system point of view it is. So I think anyways. I picked up almost .5 volts at the amps from just doing that. But I also replaced all the radio power and ground runs to 1/0 gauge wire ofc. Same with the big 3. Alternator is special order because no one does that stuff to a 2015 beetle. You have to check your grounding points to see if it's a good ground. My grounds are .. 01. I have no issues with any noise in my system but music 🎶 loud music 🐱

Parker yessir that main ground was a major problem, better to compare the batteries now that you have fixed it. More accurate comparison because you changed that ground when you changed batteries. I would expect that the AGM will still outperform the other, however, I don't think your other battery was as bad as you think it was, due to that ground. Remember that's the frame ground, which your amp in back for your subs also grounds to. Hence why you couldn't play your system-poor ground! Try it again, the comparison, on your own time. Good videos, sir! Keep it up!

just want to add the added alternator will give you more charging power, but take away from your overall HP being it will put a slightly increased strain on the engine. I only mentioned as it looks like you added stuff to make this car faster and the larger alternator you'll noticed the difference. I had a 4CYL and put a high output and my MPG suffered as well..

You should do the big 3 as well my man! I did it before adding a battery to my bass build and it would hold .5v higher then before

Hell yea I can't wait to see the improvement

You'll need that alternator for sure, because it needs a floating charge of 13.4-13.8 volts to keep it healthy and a initial charge around 14.4-14.8 volts or complete full charge to begin with, nice car though.

Good content shows that with swapn out your stock batt for an agm and doing the big 3 and lithiums in the back you can get vast improvement over stock elec without doing ho alt and everything is ready for one if you still seem to need it you’re already setup for it to bolt up.

Had to put a AGM in my Escalade Platnium. These trucks now have heated seats, cooled seats, all kinds of dvd, blue rays, seat massagers. Def need AGM in pretty much any new SUV or car.

Just picked up my new agm today. Super excited to get it installed.

We have a used battery pawn shop here, they also sell brand new batteries. i got an interstate agm battery for $150 with a 1 year no questions asked exchange, made a huge difference compared to the gold battery my car had. Their used normal batteries usually sell for less than $50, we have been using their batteries for a long time now, pretty good stuff :)

Big 3 that car too it helps in more then just car audio applications. It will just overall help your voltage a lot more also look into getting a different volt meter or tuning that one if possible with a multimeter

When diagnosing voltage drop issues, measure the actual battery terminals with a volt meter. THEN, using that as a reference, you can test other circuits for excessive voltage drops.

Was the a kenwood amp? Also what kinda sub are you running in that little space ?

i will say. had an interstate battery from 2002 in my 92 honda accord still running in 2014. had little issue running my sundown e15 on 1000 watts with a 240 watt alternator other than the big hits with the sub. it dimmed the lights etc, decided i would look to get a new battery cause i didnt want to keep running it just in case. bought an autozone battery. and never again. it died within 3 months. had a warranty and got it replaced and didnt even last a month till i went and got another new interstate battery. it was 40 bucks cheaper and way better quality and had no issue from there

I had a 2002 wrx, had Ohio generator redo alternator, added 2nd battery in spare tire area, worked pretty good.

The only way I got the most out of my system was to do the big 3 upgrade with premium OFC 1/0 ga wire, upgraded my alternator to a 300 amp, added a 105 AH agm marine battery in the trunk, upgraded the stock battery with a 85 AH agm battery. Everything is twice as loud and clear. I'm pushing 2500 true watts.

Great video like always. 😎

when you started it up it cranked better maybe because you changed out a corroded earth lead with high resistance? capacity/health check the 'old' battery to see if it was in fact the earth lead was part of the problem. doesnt an AGM charge at 14.8 volts not 14.5 like the alternator regulator will be set at for a factory fitted flooded lead acid battery? what effect will that undercharge have on longevity of the AGM do you reckon?

That subaru is awesome! You should make more videos with it.

Time to get an AGM battery!! Any doubts I've had have now disappeared after watching this video!! Thank you!!

Do you have a link for those battery terminals?

I'm curious if you considered purchasing the Odyssey Extreme or Odyssey Performance AGM battery?

Parker, do the diode trick on the sense wire at loom on alternator and see 14,8v :) I know Subaru’s electrical systems like the back of my hand

No doubt an xs batt will blow the standard flooded away however it'd be a much more fair test if the flooded wasn't absolutely and completely shot lol. I digress even if it were in good shape you'll see the difference immediately. XS uses extremely pure lead in their agms, I've got my headways in the whip btw Parker. Those WITH the XS ultrcap is where it's at. Pushing 6k and barely in the 13s it'd go to 11v before n I've got 2 xs agms! Lithium ftw

Well turn the interior lights down just half brightness helps a lot

Were are you getting the alt made ?

So I have a Honda 2002 will a agm battery work under the hood for any car?

maybe a little more bass for the Subaru later

I put the xs power d3400 under my hood and had even better results. Although my old battery was older and cheaper than your gold.

Bro I like you even more now that you have a rex and my favorite one!! Bass on bro 🤘

That ground wire probably had a lot to do with that voltage drop and in places with cold winters batteries never make it more than 3 years. You should compare the xs battery to a brand new battery exactly like the one u took out, just to see if it's worth spending extra money for xs battery. With a new battery lie the one u took out I highly doubt there'd b much of a voltage difference between the 2. And the gold battery was probably less than half of wat the xs power battery cost

Did you ended up changing the alternator ? the company you bought it from has a website ?

Love the content parker.can you do a video of installing a DC to DC charging system for the lithium batteries with one lithium in the engine bay n one for the rear as well as hooking up a external regulator going to the rear battery first n then to the engine starter battery .that's lithium.so your rear gets the most charge from alt. Before charging you starter battery

I just replaced a sla with an agm and definitely noticed a difference. My system is not particularly big, about 1200w total and my old battery ran it for a couple of years. With the agm I can feel the subs more for sure. I didn’t think it would make that much of a difference. Sundown sfb600 running 2 10” lcs and I can turn the bass knob up significantly more before clip. If you have a smaller/budget build the agm battery is the way to go.

Has it solved your dimming lights. Im debating between a second battery or replace my main battery with an agm battery. I don't want to occupy too much space in the trunk

Yep batteries make a world of difference I didn't know that AGMs maintained 13 volts resting 12.75 is 100% charged 12.65 is 75%, so resting at over 13 volts damn not including lithium I wonder what can be better than that

You should do a review of the DC audio level 3 12” sub!!

Hey I have a question, can I use a AGM 55ah -12v mighty max battery, I bought one new for my trolling motor and never used it..

you can stop all that corrosion on terminals or wires with silicone grease painted over terminals after hooking up terminals the grease is heat and waterproof, I never get any corrosion on terminals.

Where did you buy the distribution blocks?

How can I get an alternator built for my 07 Hyundai Tiburon I’m having a hard time finding anything from multiple companies

The only drawback to agm is they suffer a cca drop in extreme cold (below 0)

Have you heard of almani s5 subwoofer? Any good?

Any specific reason why you picked this over a odyssey battery?

Yeah my yukon denali has a spot underneath the hood for adding a second battery and so I threw my old D3400 in there with the oversized oem battery and it was reading 15.2-15.4 Volts regularly right up till I swapped out my alternator for a mechman 320a which now for some reason my voltage went down to 14.6 and if I let the truck sit for more than a week without running it to keep everything charged up the damn thing drops right down to 8v so I have to find the parasitic loss and why it is doing it strange but when I had the old alt and same batteries I could leave it sit for months with chargers plugged in and everything and it never had a single issue but ever since I put the mechman alt in I've came out to find completely dead batteries a handful of times and I have even gone as far as unplugging all chargers and accessories that I thought might be draining it but nope still an issue somewhere that I need to sort out 🤷‍♂️🤦‍♂️ I may just try and switch back to my old alt and see if that truly was the problem because if so that's a $550 waste of money and I won't run that mechman till my dual alt bracket kit comes in and I'm ready to install all my limitless lithium batteries and supercaps....

Your other battery had to have had some kind of damage dead cells or electrolyte levels not proper or something even while taking the agent to consideration from the power loss you described there was definitely something going on

I AGREE PARKER I got to xp3000 in the back ofmy yukon and a d3400 under my hood

Water in the wet cell, no sir! 🤣

Awesome test! I just replaced my starting battery with an XS-POWER D6500. My headlights were dimming pretty bad with a SIA-3500 and an X-15 even when I didn't have it turned up. Voltage is better now but I still need to do Big 3

Did the plate come with it? If not how would I hook up my amp wire? Or where can you buy those plates?

Really good choice of car

That corrosion always happens over time with cca wire . Subaru is love , only use ofc . Put cca in cars that you would like to see burn .

Hey Parker, if you leave that tuner plugged in sometimes it can kill your battery when not driving. If I don't drive my car for more than a couple of weeks and I leave my hp tuners plugged in. It will drain my battery.

I swapped from a reg flooded battery to a oem style agm and I’m impressed.

Wow NEW AGM are better than 3years OLD Conventional battery what a good review thank

You should do the sound stream r3 12” 800 watt rms.

Great vid. My question is at what voltage them AGM won't charge I mean at what voltage is too low for them AGM?

The only possible con of AGM us that they like to be slightly discharged before you charge them back up (with alternator of course)

Wait till this kid discovers duel battery systems 🤯

Need to see new to new batteries. Especially after having to clean the corroded ground.

I just installed a XS D4800 in my 300c, and the voltage sits @ 14v, When I play music it fluctuates from 13.5 to 14.2. However the original factory battery was sitting @ 14.6 and did not fluctuate as much only like 14.2 never dimmed my lights. I have not tried the XS D4800 at night yet to see the lights.

i love your videos. i wish i could talk to you in person. i have so many question hahahah

Hey Parker, can I use the xs d3400r for a Toyota Camry se 2017

Love the Subaru

They do vent if it gets overcharged

I run drycell and lithium cells together it works good

damn, thumbs up for the car

Lithium batteries are going to be the new norm.

I was shocked that installing a new AMG battery in my 2020 RAM 1500 made a considerable difference in starting! Nowadays, the old "flooded" batteries only last about 3-4 years and I expect this powerful AGM to last much, much longer.

This video is like an advertisement for the AGM. And you are a tech guy? With the cranked cable for the battery. Oh, I've just noticed that my cable is broken...

I think what your actual problem was the neg lead and this will sound crazy but those colored batt terminals I personally have had neg luck w them,, had a stereo system w subs n two crossovers and after couple weeks or so system was playing weaker n turn out it was those colored terminals,, w this new batt your putn in fixes that since it replaces those other terminals,, n I'm not sure regardless of corrosion on old ground wire that its proper 2 use stereo amp 4 guage ground wire as primary,, great you got taken care of

I have 2 jl 300/4 and 1 1000/1v2 which battery do you recommend?

I love the WRX how much boost u making and fyi I have 8 of them 3k for the (smart truck) need two more 😂😆

That alternator below 13.8 volt is a must replace for a new one, for and AGM battery you will need constant or more than 13.8 volts to charge it properly or you will ruin it within a year. if you are not able to keep the 13.8volt with the new alternator you are better off with a bigger acid battery ... just my 2 cents... good luck, and i love that car!

Who is building the alternator? I need one built for my genesis coupe

Question I've had, can you put a system in an electric car? How? Just food for thought as the world is slowly transitioning towards making more electric models

Do the bus bars come with the screws or what size screws would I need?

What's that distribution block called?

What is a reverse polarity battery used for?

god dam nice car and nice system

They say not to use as main battery.

I got one of those die hard platinum agm batteries from advance auto or auto zone, don't remember which store but it was like $240 and it didn't really do shit for my lights dimming. I mean it might not be quite as severe but it definitely disappointed. I have a 2005 chevy trailblazer LS with a 150 amp stock alt and I have real bad dimming but my gauge on the dash doesn't drop that low, maybe around 12 for the lowest but the needle only drops for like a second it doesn't stay low. I only have a Orion xtr1000.d on a audiopipe bdc4 12 and shouldn't be dimming my lights like that. No battery lights come on or anything to indicate a bad alt, so I just figured it was the battery so I got that agm and that didn't fix the problem. I'm running 4 gauge sky high wire so that's not the problem. I wonder if it's some kind of sensor on the trailblazer cuz I had this same setup in a 97 Ford taurus with a smaller stock alt and cheap lead acid that came with the car and didn't have this problem. Well it did dim a little but I just turned the amp down a little and it was fine, but the trailblazer, smdh, even the smallest amount of bass dims the lights bad. It really dims when the song has punchy kick drum bass compared to songs that have just lows. Songs with lows with no kick drums do alright, but that kick drum type bass really turns my lights in my car into strobe lights. Any suggestions to why this is happening?

Where did you buy the AGM from

I’ve been trying to find a video on this forever

✨🗣does the xs come with the plates

Can u use one xs battery in the back and regular in the front for now

You should do the big 3 to your alt on the subi

After watching this video and all the 30 years I have worked on cars. The ground is more important then the type of battery. When I seen the ground I knew that was a bigger issue than the battery type.

Im pretty sure this is a group size 51/51r hence the d5100r name. Also im using this in my civic which uses 51r.

I run yellow cap Optima batteries. One under the hood, and one in the trunk.

Sup my brotha from anotha motha excellent good video content i do like agm but . Lithium battery for the win but you can't put a Lithium battery under the hood without having a meltdown

This is basically a bad ground vs fixed ground comparison

Why upgrade a vehicle beyond the capacity of basic components?

You absolutely have to charge these type of batteries before using, or it will damage them. Just fyi for anyone thinking of buying one

You could have went with a larger size and capacity battery if you went by the measurements.