AGM battery questions (ready to buy a battery)

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Posted by RTM
9/04/2024 11:37 AM
#1

In an older post someone suggested I buy an AGM battery, Braille Battery 83121 Advanced AGM Lightweight Racing Battery. 

After reading a little about it I discovered that it appears to need its own charger.  Meaning I cannot hook it up in my mustang and run it like a normal battery, or am I reading it wrong?  Are lithium batteries able to be installed and run like a normal battery?

https://www.jegs.com/i/Braille-Battery/147/B3121/10002/-1

 
Posted by Rudi
9/04/2024 3:07 PM
#2

I can’t remember which Li  battery but they said built in electronics deal with vehicle alternator charging.
All of my battery wiring and bracketry is custom made for Optima so I’m staying with Optima, first one lasted 11 years and about 5 on the second one.🤞


Good work ain't cheap, Cheap work ain't good!   Simple Man
 
Posted by TKOPerformance
9/04/2024 4:06 PM
#3

I can't say for that particular battery, but the AGMs in the my F250 can be charged with any regular charger.  Some manufacturers batteries need a special charger though I think, so it may just be an oddity of Braille. 

I would avoid lithium in a car battery like the plague.  Great for power tools, but if you ever got a heavy discharge situation and it overheated, well, I can tell you a story I may or may not be able to know about a vessel the Navy was working on with lithium batteries that almost killed its entire crew when the batteries overheated.  There was nothing wrong with the lead/aid or Ag/Zn batteries they had in it before, but they just felt they needed to push the envelope. 
 

 
Posted by Rufus68
9/04/2024 4:06 PM
#4

You are over thinking the AGM.  AGM is absorbed glass mat.  It is still lead plates and battery acid.  Your alternator will work fine.

Regarding Lithium...  You can charge a LiFePo4, lithium iron phosphate, battery with your alternator; but, you should not charge a lithium ion battery with the alternator unless it has been specially designed for it.  The lithium ion batteries are fires waiting to happen if over charged.  The LiFePo4 batteries are safer.
 


1968 T-code Coupe with a 302.  Nice car, no show stopper for sure, but I like it.
 
Posted by HudginJ3
9/04/2024 7:21 PM
#5

I put an EarthX battery in the Cub and it works great. It is a lithium battery that has been approved for general aviation and experimental aircraft as well. They have come a long ways in a very few years. It uses the aircraft generator to charge it. It does need a special bench charger. I don’t have one. You can use  a regular charger on it but you need to watch it and not let it get hot.


70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
 
Posted by Bullet Bob
9/04/2024 7:37 PM
#6

Bob, I have been using an Optima AGM in the heap for over 6 years.  If you run them way down to where the static voltage is too low, you will need a charger designed for that situation...neighbor and I went together on one.  Butt (TS&T) under normal situations you will be fine letting the car alternator keep it up to full charge.  Excide also makes AGM batteries under various labels, Car Quest for one.  The good thing about the AGMs is that they don't weep acid around the posts and cause corrosion of the clamps.  Went through that with the Ford battery in my 2013 F150.  Finally bought an Interstate AGM, problem solved.


"you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
 
Posted by RTM
9/05/2024 4:38 AM
#7

We have an AGM in my son’s truck and I just installed one in my truck.  The one listed on Jegs website is different than what I bought for the trucks.  Keep in mind, it is the size of the battery I’m after so a stock size battery will not fit.  I really should have added to my old post and not started a new one.

All the negatives about lithium battery’s appears to be addressed in this one but it’s not cheap. Reading each description on the battery’s sure does make it appear the lithium one is the better and safer choice.

https://antigravitybatteries.com/products/starter-batteries/restart-oem/atx30-hd/?srsltid=AfmBOorhzl8JY1LuVIIJ8WvwRrEEP6vDCEufNICSZhECyVePKKAoSuph

Correct me if I’m wrong but the lithium I listed has all the built in protection where the AGM has none.  The lithium should out last the AGM battery by a few years, I would expect it too.

Sounds like the AGM can be used in a car as long as it’s fully charged but what happens if I kill the battery trying to start the car and then it really needs to be recharged?   I’m guessing I shouldn’t jump start it?  If the battery is dead then my alternator would be charging it which wouldn’t be good?

 
Posted by BobC
9/05/2024 5:59 AM
#8

All this battery discussion made me check when I installed the "Super Start" battery in the 66.  I bought it in 2004. Makes me curious how long it is going to last.  I did buy and carry a jump pack just in case. I does go on a battery tender when the car is parked.


Bash Host MSBB XVI.       BobC    1966 Mustang Coupe
 
Posted by TKOPerformance
9/05/2024 6:05 AM
#9

For $630 I can buy 3 AGM batteries.  I think the claims of longer life are kind of ridiculous at that point.

I've had two AGM batteries on my shelf for close to 2 years as my Diesel is down.  I've tested them numerous times and they are always fully charged.  I even had to use one to start another vehicle and it worked just fine (backyard load test). 

I've charged the AGMs with the same alternator that's been in the truck since I replaced the garbage AutoZone replacement.  I've never had an issue with these batteries and Diesels torture test batteries far more than any car ever will.  At start up I'm cranking over and engine that has 22:1 compression, while running glow plugs, a big fuel pump, and all the electronics (including firing the injectors which operate at 48V (capacitors in the FICM step up the voltage)).  The alternator doesn't even energize until the engine has been running for about 30 seconds (I don't know why exactly its in the programming and can't be changed).  So every start those batteries are drawn down pretty hard.  Based on my experience with lead/acid vs AGM there is no comparison.  AGM is the clear winner.  Due to cost and the fact I need 2 high CCA (750-850 each) batteries I wouldn't even contemplate anything else.  I'm sure I could spend more money on a battery, but I doubt I'd see any difference in real world use. 
 

 
Posted by Rufus68
9/05/2024 9:45 AM
#10

RTM, you said that Lithium batteries had built in protection and AGMs do not.  First, since there are two significantly different types of Lithium batteries, one should specify whether talking about a Lithium Ion or a Lithium Iron Phosphate battery.  The Lithium Ion need very very good protections since they are prone to catching fire...  and a very hot fire at that.

AGM batteries are lead acid batteries and do not need built in protection to prevent a fire.

Lithium Iron Phosphate batteries are not prone to catching fire easily and the charge profile will work with an alternator.  They do have built in battery management systems primarily to manage the charge in the cells to attempt to keep them balanced.

This is how I understand it.
 


1968 T-code Coupe with a 302.  Nice car, no show stopper for sure, but I like it.
 
Posted by RTM
9/05/2024 11:50 AM
#11

I just want to make sure the AGM I posted is safe to use in my mustang.   Reviews show people have it in their cars so I should be good.  Trust me I don’t want to spend $700 on a battery. 

The antigravity battery says it’s a lithium battery.

 
Posted by RTM
9/05/2024 2:14 PM
#12

Call Jegs and talked to tech support about the AGM battery I want to use.  He didn’t sound too convincing but said yes I can use the AGM battery I want in my car.

 
Posted by RTM
9/05/2024 3:57 PM
#13

Pulled the trigger and order the AGM from Jegs.  I need a battery so I can finish up cutting my wires and cables to length and finish the battery tray tied down modifications.

 
Posted by Rufus68
9/05/2024 6:15 PM
#14


If you look at the photo of the battery on their website, it specifies Lithium Ion.  Avoid this type of battery in a car.  No reason to include this fire hazard when so many other safer options are available.
 


1968 T-code Coupe with a 302.  Nice car, no show stopper for sure, but I like it.
 
Posted by Rufus68
9/05/2024 6:19 PM
#15

If you want to see lithium ion fires, just do an image search for Tesla car burning.


1968 T-code Coupe with a 302.  Nice car, no show stopper for sure, but I like it.
 
Posted by HudginJ3
9/05/2024 9:32 PM
#16

Interesting that an AGM in an airplane doesn’t last as long as a “wet” battery but I'm still running my original AGM in my 2019 truck. The “book” says it should last two more years than the wet battery


70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
 
Posted by Rufus68
9/05/2024 9:47 PM
#17

The original AGM battery in my 2003 Miata lasted 13 years.  The second AGM (different manufacturer) lasted 8 years.  I put the 3rd AGM battery in this year.


1968 T-code Coupe with a 302.  Nice car, no show stopper for sure, but I like it.
 
Posted by TKOPerformance
9/06/2024 5:47 AM
#18

HudginJ3 wrote:

Interesting that an AGM in an airplane doesn’t last as long as a “wet” battery but I'm still running my original AGM in my 2019 truck. The “book” says it should last two more years than the wet battery

Are the wet batteries being serviced?  A major advantage they have in theory is that if you know what you're doing you can work some magic on them.  My father in law knows all the secrets from his days on subs in the Navy.  I've seen him resurrect several batteries I thought were done. 

Another possibility is that since they are used in aviation there are probably different standards on their manufacture.  What's killing automotive lead/acid batteries is recycled lead full of impurities.  I'll bet batteries for aviation use are spec'd as requiring the use of virgin lead. 
 

 
Posted by HudginJ3
9/06/2024 10:14 AM
#19

I’ve “restored” a couple of batteries back in my old days. It was just a wash out of the deteriorated material and add new acid after inspecting the plates to make sure they were still standing up straight.
      I don’t know about the lead chemistry just what I’ve seen and heard from the manufacturers. The license renewal seminar talked about the Concord brand. Of course they are the best out there according to themselves. All the battery cases are heavier than automotive and each cell has their own cap that is designed for aerobatics and rough air to keep the acid in the battery. The battery is then placed in an enclosed box designed to capture any escaped acid and then vented overboard with air in and air out tubes. Acid comes with a new battery in a separate container that needs to be added to the battery when put into service. It is a MIL spec acid so with that I would assume the lead plates are a MIL spec as well. The price of them has more than doubled since Covid.

Last edited by HudginJ3 (9/06/2024 10:24 AM)


70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
 
Posted by TKOPerformance
9/06/2024 12:41 PM
#20

I think I still have an old battery and box up in my shop from I'm not sure what.  Possibly it was from my dad's chopper or my neighbors A-T6.  I remember they used to say pricing for parts is as follows:

Automotive Part - X

Marine Part - 2X

Aviation Part - 10X
 

 
Posted by Rudi
9/06/2024 1:56 PM
#21

Spaceship part - 10,000x


Good work ain't cheap, Cheap work ain't good!   Simple Man
 
Posted by TKOPerformance
9/07/2024 6:49 AM
#22

Rudi wrote:

Spaceship part - 10,000x

Good one!

Also, I want to see how a zero G carburetor works...

 
Posted by Rufus68
9/07/2024 8:42 AM
#23

How about a negative G carburetor for fighter planes:
https://en.wikipedia.org/wiki/Pressure_carburetor


1968 T-code Coupe with a 302.  Nice car, no show stopper for sure, but I like it.
 
Posted by Rudi
9/07/2024 9:06 AM
#24

Rufus68 wrote:

How about a negative G carburetor for fighter planes:
https://en.wikipedia.org/wiki/Pressure_carburetor

 
That article brings an eye opening perspective on dripping pots!😱


Good work ain't cheap, Cheap work ain't good!   Simple Man
 
Posted by HudginJ3
9/07/2024 9:21 AM
#25

The oil pressure, manifold pressure, and fuel pressure sensors were originally around $25. each. The diaphragms started to wear out in them and an Airwortiness Directive was issued to replace them with $285. each sensors. 
       Aircraft fuel injection is pretty much the same as a pressure carburetor with the addition of a spider to run the fuel to each cylinders intake port.


70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
 


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