Litium car audio batteries

[wew lad 5,000+ posts]

The following information is ASSUMED there is 0% resistance in output by stacking 10x the cells in the pack.
These test results were taken from 1 single 12v pack. 42ah would consists of 10x the capability so the results below will take our data and multiply by 10.

You may want to derate the numbers back maybe 0-5% to take into account resistances from bussing and uneven power distribution.

The following results are Battery only, no charging system connected-

@1.5C- takes 35min 0 sec to reach 12.19v

@5.5C- takes 9min 0 sec to reach 12.24v

@7.6C- takes 6min 0 sec to reach 12.26v

@10.5C- takes 4min 0 sec to reach 12.11v

@12.7C- takes 2min 30 sec to reach 12.09v

@14.1C- takes 2min 30 sec to reach 12.00v

@15.4C- takes few seconds to drop to 11.93v, then rises to 11.97v and holds for exactly 3 min before slowly falling down.

Burps-

@11.0C- 13.10v

@13.3C- 12.86v

@14.9C- 12.80v

@20.7C- 12.18v

@25.0C- 11.76v

interesting, do you have them available in any store by chance? I'm interested in the dimensions. If I can 3D print a case that will fit in a G34/78 slot that'd be cool

 

[Papermaker85 5,000+ posts]

The following information is ASSUMED there is 0% resistance in output by stacking 10x the cells in the pack.
These test results were taken from 1 single 12v pack. 42ah would consists of 10x the capability so the results below will take our data and multiply by 10.

You may want to derate the numbers back maybe 0-5% to take into account resistances from bussing and uneven power distribution.

The following results are Battery only, no charging system connected-

@1.5C- takes 35min 0 sec to reach 12.19v

@5.5C- takes 9min 0 sec to reach 12.24v

@7.6C- takes 6min 0 sec to reach 12.26v

@10.5C- takes 4min 0 sec to reach 12.11v

@12.7C- takes 2min 30 sec to reach 12.09v

@14.1C- takes 2min 30 sec to reach 12.00v

@15.4C- takes few seconds to drop to 11.93v, then rises to 11.97v and holds for exactly 3 min before slowly falling down.

Burps-

@11.0C- 13.10v

@13.3C- 12.86v

@14.9C- 12.80v

@20.7C- 12.18v

@25.0C- 11.76v

I'm an electrician and this doesn't make sense.

Current draw over time is all I care about.

800 amp load for 3 seconds results in a final voltage and takes x time to recharge

 

[wew lad 5,000+ posts]

I'm an electrician and this doesn't make sense.Current draw over time is all I care about.

800 amp load for 3 seconds results in a final voltage and takes x time to recharge

you're a stupid electrician then who doesn't understand C rating. go read up on it before you talk ****

 

[Boominburban 10+ year member]

I'm in the middle of building a 264ah, 13.8v, LTO lithium bank for the Boominburban. As I just don't want another 500 lbs of agm's in it. It's already gutless enough!

 

[shizzzon 10+ year member]

If you need more detail...

ALL tests were taken from fully charging, then letting voltage drop to 14.0v, then engage tests.

Ah is actually 4.38ah but we rate at 4.2ah.

With highest C duration test, Ah still tested out at 4.236ah.

Burp tests were done in 2s duration.

ALL temperatures were taken during all tests as well if needed.

Dimensions-

Width- 1-1/4"

Length- 4-1/2"

Length with terminals- 5-1/2"

Recharge rate- 1-3C recommended, 5C MAX.

Meaning- smallest ah pack safe from alternator is alt rating divide by 5.

So, 2 370a alts would need at least 148ah.

This is only downside with these cells is limited charge ability.

If you need faster charging, we can have these new LTOs shipped to us for testing. They charge much faster

 

[Papermaker85 5,000+ posts]

you're a stupid electrician then who doesn't understand C rating. go read up on it before you talk ****

I work in industrial complexes we don't give a **** about "C" ratings. Discharge over time vs voltage loss.is the only issue

 

[Papermaker85 5,000+ posts]

If you need more detail...
ALL tests were taken from fully charging, then letting voltage drop to 14.0v, then engage tests.

Ah is actually 4.38ah but we rate at 4.2ah.

With highest C duration test, Ah still tested out at 4.236ah.

Burp tests were done in 2s duration.

ALL temperatures were taken during all tests as well if needed.

Dimensions-

Width- 1-1/4"

Length- 4-1/2"

Length with terminals- 5-1/2"

Recharge rate- 1-3C recommended, 5C MAX.

Meaning- smallest ah pack safe from alternator is alt rating divide by 5.

So, 2 370a alts would need at least 148ah.

This is only downside with these cells is limited charge ability.

If you need faster charging, we can have these new LTOs shipped to us for testing. They charge much faster

They are usless

 

[shizzzon 10+ year member]

Maybe for you, but for me, I can run close to 40kw of amps on 1 alt staying above 12v.

 

[Papermaker85 5,000+ posts]

Maybe for you, but for me, I can run close to 40kw of amps on 1 alt staying above 12v.

Proof

 

[shizzzon 10+ year member]

And weigh under 300lbs of batts and cost right around $2,000.

 

---------- Post added at 04:54 PM ---------- Previous post was at 04:53 PM ----------

 

I've already proven infinite scenarios with the specs above.

There is literally nothing else to be said...

 

[wew lad 5,000+ posts]

And weigh under 300lbs of batts and cost right around $2,000. 

---------- Post added at 04:54 PM ---------- Previous post was at 04:53 PM ----------

 

I've already proven infinite scenarios with the specs above.

There is literally nothing else to be said...

Please don't waste your time on papermaker, he's more interested in making himself sound smart than actually discussing things..

If one wanted to purchase these, would the only option at this point be directly from you (not that it's a problem, but I don't want to make it any more difficult)

 

[shizzzon 10+ year member]

Yes because we want to protect the source.

They say we are 2nd business to find them and import them.

There is much bad talk about getting lithium cells from sources that may be unknown

These are a123 cells that were only to be sold to large contract orders only.

Now regardless if they are real a123s or 100% replicas from reverse engineering, what we DO know is the test results meet their spec sheet for car audio use enough.

We say enough because they can burst over 80C BUT if sized right, that should never happen nor is a parameter we are willing to test.

The Ah rating from 1C to 16C changes only be less than 130mah. That's ridiculously good!

The source moves product through a no-name importer before it arrives to it's destination to protect the importer as well.

We can have the source ship directly to anyone. It takes 2.5 weeks to reach your door.

We do not charge crazy fees for larger and larger orders.

The source has all shipping tactics taken care of regardless if it's 4 cells or 100 at a time.

 

[wew lad 5,000+ posts]

Have you done any testing with these in parallel with other types of batteries, and caps?

I'd imagine with other things in parallel I could get away with excess charging capability because it'd be split between other things but you're doing a lot of testing so maybe you have some insight.

 

[Papermaker85 5,000+ posts]

And weigh under 300lbs of batts and cost right around $2,000. 

---------- Post added at 04:54 PM ---------- Previous post was at 04:53 PM ----------

 

I've already proven infinite scenarios with the specs above.

There is literally nothing else to be said...

Simply put. I see no discharge rate over voltage.

Aka. Anybody can claim discharge rates. But 40kw at 12 volts is 3334 amp with no losses realistically 3400 amps.

Let me see that pack discharge 3400 amps for 2 seconds without dropping past 12 volts and charging up in between another cycle for 2 seconds and another 2 second load.

Anything else is rubbish

 

[Papermaker85 5,000+ posts]

An amp hour rating anyway is complete b*******.

The Way companies Market batteries is totally b******* you want to do some real marketing provide output vs voltage over time.

Amperage output vs voltage over time and recharge rate.

I contacted you to test a unit with no answer. My money's going on what I know works.