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Lithium cells advice.

3420 Views 37 Replies 11 Participants Last post by  Bushwacker
I found a good deal on two lithium Lithium LiFePO4 batteries.
id get one of these: https://www.amazon.com/gp/product/B09TWGZ37P/ref=ox_sc_act_title_1?smid=AYUFLPCBY5M3&th=1

Or 2 of these:

im currently running 2 large AGM batteries, but im doing some upgrades with my amps/subs so i want to make sure my electrical will hold up,my alternator is holding its own now.

lastley do i need a battery isolator? I dont think so since everything is 12v and my system is staying at 14.2v i just dont sit and listen to my system unless the car is running.

My best goal outcome is to just put the lithium in parallel and thats it besides a GIANT fuse.
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Im not in no big hurry,so i can get as much info as possible.
Im also seeing these Superbeast cells on ebay, they are lifepo4 cells also.
One is 24v and it says you can separate the bank and have 2-12v banks.
but i wonder about if electronics are needed with them as controller’s

i do like the simplicity and possibly safer of the ones i linked above.

Code- Audio for 5% off

the headway cells in the super beast are much better suited for audio.
Good site for bars, wraps, cases etc for lithium and super cap banks.

32-48ah of headways and a 500 farad supercap bank and you can remove those heavy agm batteries. The 500 farad cap bank by itself can start a car many times with ease. I even had a maxwell 58 farad and it would start my car by itself.


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I thought I read that mixing lithium with standard/agm batteries is a bad thing to do. If your voltage doesn't go below 14.2V you are more than good with your current setup....
Imo if you have 2 or more Batts you should have an isolator for when the vehicle is off.

Not having them isolated is like having that one friend who always seems to come around soon as you crack a beer!




They both degrade unequally and one ends up draining the other in like a parisite.
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At these prices im going to have to buy as i go along.
I have 2x JP23v2 bass amps which each can put out 4k watts rms each.
My electrical system is holding its own at this point.
But,,,,i have a SALT4 amp heading this way. Now i dont expect to run all three at the same time now, But i may down the road.
IF and thats a big if i buy a superbeast ill get 2x 12v banks?
Im sure i can be shown where to cut. But dont these types of banks need electronic controllers to monitor each cell. Or is that built into the head of the cells like vaping batteries use?
Then a cap bank? Can you point me at the best price for the money but on the beginers side of a cap bank?

lastly, I guess i need an isolator, they have one on the site? How many amps i need?
Or an Amazon 300 watt isolator what i need?

My car runs about 14.3-13.9v with a 180A alternator and it does fine so i dont with to remove my XSPower and Ultima agm batteries. For one my car comes with its battery in the trunk under the cover with the spare tire. To do so would have to wait till spring when im set to finalize my system.

i think i can get the superbeast,but is a charger required? And then the isolator.
this is why i was looking at the lithium cell in the first post.
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Lithiums, I believe they are not to be shipped charged for safety reasons. You will need a lithium charger.

Yes, isolator... as far as size goes I can't really say. Maybe as long as it's more that what your alternator is rated. The bigger the better.

As far as cells are concerned I have no idea... I've never built a bank or played with them before. Maybe check out that Facebook page that was mentioned. I highly suggest you do some research before buying things. Last thing I want to see is you to harm your self or burn your car down. I'd personally go with LTOs if I was to build my own. Yinglong I believe they are.

I also think that lithium cell banks want a higher charge rate. I think 14.4 is on the minimum side.
They do come in 12v banks.
which is a middle ground as they top out at 14.4 iirc
Ive read also LTO is a safer lithium, but the lifepo4 cells in the super beast should be fine imo also.
Its less building and just rearranging the cells into 2 banks,and 2 is better than one If im going down this path.
Amazon has affordable chargers and i need to see if i can find chaeper isolaters. But in my mind i dont necessarily need one IF the cells match my batteries currant voltage.
Dont worry im not in a hurry and wont make a rash purchase.

On a side note Honda, im gonna contact D4S and see if i cant swap my subs for 1ohm dvc.
Thats good for my SALT amp, and i can link the JP23’s and run them linked If need be. Heck they will run .5ohm’s also.
Worth checking out anyhow.
Tell me if anyone knows,how many amps should the isolator should be?
I read on the net,which i rarely trust it should be what the alternator puts out plus a bit of head room.
Mine is 180A alternator so im guessing 240A may do the job.
Add up the all the fuses from your system. The isolator needs to be able to handle the system amp draw.

So for instance. A system with 3 amps. One amp has a fuse with 40 and two 100. You could do a isolator rated for 250-300 amps.

Sonic electronics is a good place to check them out and get the part numbers if you want to buy them elsewhere. Also check reviews.
Lithium cells
Lto banks you want 14.8v minimum charging voltage

lifePo4 bank work better with oem alternators and charging less than 14.8

the reason you might see lto batteries like maybe something xs power has and being used with oem alts is because they build them with one less cell
Within each type of lithium like lto or lifePo4 there is them different chemistry like headway or Shenquan
Or lishen and yinlong. They each have their ideal voltage range and charge voltage and different C rates.
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In regards to fusing, they are designed to blow when you've exceeded the rating by quite a bit. The more you exceed it the quicker it blows. So if you have a 100 amp fuse, you can run 120 amps for quite some time before it blows. It will blow pretty quickly at 200% of rating. Great for the fuse since it won't blow (and you won't be shopping for a new fuse that's hard to get like an ANL), not so great for an isolator you bought from adding up the fuse ratings. So you want to go bigger (or figure out the true draw, like you see on some of the videos on Youtube. Sonic is a good place to look, the 500 amp one isn't too much more so would suggest that route honestly.

Add up the all the fuses from your system. The isolator needs to be able to handle the system amp draw.

So for instance. A system with 3 amps. One amp has a fuse with 40 and two 100. You could do a isolator rated for 250-300 amps.

Sonic electronics is a good place to check them out and get the part numbers if you want to buy them elsewhere. Also check reviews.
With "lithium" batteries lots of stuff out there, formulations (not the traditional lithium ion, but others that are safer from a catching fire perspective and/or from a getting damaged from an over/under charging situation). Do some research, lots of variables too (how you're going to charge it (some guys do a SPL comp so they are cool with a bank they don't charge off the alternator), temperature range (if your in Alaska or the upper midwest, some don't take kindly to the cold), budget, etc.
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The superbeast module is a 24v 48ah 8s setup that you reorganize to 4s to double the ah capacity. I believe it's 96ah at 12v.

Jim's economy bars are about the cheapest option for bus bars, a cell balancer is simple and easy to hook up.

The headway 38120hp cells are usable at 5c so your ah rating ×5 to get the max usable draw. An 8 ah cell can discharge 40amps. 96ah is 480amp of usable discharge. They will still sag to a max 13.6v underload but they rarely drop below that unless the amperage damage exceeds 5c.

6s lto needs to be charged above 14.8v to be really usable but at 15v you are at 80% charge, 15.5v 90% charged 15.8v 95% charged iirc. But they will only sag to a max of 14.4v. lto also has higher c rates with c rates as high as 75c.

5s lto shouldn't be used unless your car does not charge above 14v which would be old style alts designed for old flooded cells.

Lto is the preferred chemistry in most cases as it's incredibly stable and easy to use but lifepo4 are also easy to use and stable they just have a shorter lifespan granted you likely won't reach end of life of the battery before the car falls apart. Unless you abuse the cells
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My understanding is that for the people that run two alternators, you run one set to charge flooded cell batteries at a lower voltage, and another one set to a higher voltage for whatever lithium chemistry you use.

5s lto shouldn't be used unless your car does not charge above 14v which would be old style alts designed for old flooded cells.
My understanding is that for the people that run two alternators, you run one set to charge flooded cell batteries at a lower voltage, and another one set to a higher voltage for whatever lithium chemistry you use.
You could but why? Most cars can handle 15v many 15.5v. I'd rather ditch the flooded cells and run lithium at 14.8-15.5v. simple battery delete under the hood and at least 40ah of lithium can handle the car plus 2500w easily. Especially with 100plus amps of alt to keep it topped off during transients.

Pure spl comp levels you would want more but many people run 40-80ah daily. And depending on chemistry 40ah is about $500
i like these a lot. they are used, but i think these would be a really nice high current switch for you, used in 12V system.
i purchased a small batch of these and i have been testing them out, they have been performing well for me on my bench setup.
I plan to run ultra-caps & headway cell setup. my alternator voltage runs 13.5V when it warmed up, 14.5V when it's cool.

"TE Connectivity EV200AAANA 500a 0-900vdc Tyco 12/24v"

I have seen these relays used in electrical vehicle applications, they are very nice.
these would work well for isolation/switching/connecting battery packs, imho.

Tell me if anyone knows,how many amps should the isolator should be?
I read on the net,which i rarely trust it should be what the alternator puts out plus a bit of head room.
Mine is 180A alternator so im guessing 240A may do the job.
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Yeh i seen that on there but wasn't 100% sure it was an isolater.
I hope im done bying music gear and start on the electrical.
Atm i can see me buying the superbeast and configure it as need so i have 2x12v banks
While not 100% needed id like to add a 370amp alternator and an isolator.
I have till spring to buy it all as thats when i finalize my build.

with that alternator id still keep my 2x AGM cells and add the 2 lithium banks.
that should be good for a 10k watt system. Im at that now, i just try and forget about how much all that power cost.
Luckily i just have a large car and not a van or suv,its all thats holding me back is space to put things.
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