Making your own LiFePo4 lithuims..............

[K-DAWG]

Anyone thought of making your own Lithium batteries? On EBAY you can buy your own cells and make your own. Here is a whole set of 8 cells to make two 12 volt 86ah batteries or one 86ah 24 volt battery for $620. You would still have to purchase a BMS for them though. Depending on which one you buy that could add around 100 bucks to the total. $620 dollars is a extremely attractive price. I have looked into this briefly and from what I have been able to gather is that the all of the battery LiFePo4 cells are made in china. Companies I assume have them built to their specs. Ship the cells here and assemble them. Maybe get a discussion going to see what the pit falls could be going this route.

https://www.ebay.com/itm/Lot-of-8-pc....c100903.m5276

[NOTGSXR]

Listing removed

[K-DAWG]

Fixed the link. I messaged them asking for the brand name. Brand is CATL. These are Pismatic Lithiums housed in Aluminum cases.

http://www.catlbattery.com/en/

[K-DAWG]

Here is a set (4) of 68ah cells that will make 0ne 68ah 12 volt battery for around $350. These are EVE brand.


https://www.ebay.com/itm/4-pcs-New-L...H/162602112529

[scj]

http://nordkyndesign.com/assembling-...ne-house-bank/

A good read for DIY’ers

[mgeod]

http://nordkyndesign.com/assembling-...ne-house-bank/

A good read for DIY’ers

Good read there .. some very interesting info

[scj]

https://www.tequipment.net/BK1665.html

This is about as cheap of a regulated charger I could find to do load balancing and according to what I read, it's a throw away so I would not think it's going to last if you were planning on building several batteries from it.

Reading all this makes me wonder how they build the lithium marine batteries available commercially? A lot of TLC needs applied to build these correctly.


I've read just about enough to be dangerous but this has me wondering about what you're paying for when you buy a 12v, 24v or 36v lithium battery? You can build a 12v battery with a minimum of 4 cells but it looks as if a good robust 12v battery would be configured using 8 cells. With the physical space limitations of a marine battery, what configuration of cells do they use to create a 36v battery? It would take a minimum of 12 cells to build a 36v battery. Knowing what little I know, it's makes sense why they advise using two 36v batteries to have a robust 36v trolling motor system. That's 24 cells being used just for a trolling motor. No wonder it's a preferred system........
If I were going to build myself a battery system for my boating needs, I would use 24 cells but they would be configured into two 12v batteries as I use a 24v trolling motor. I would wire them for the trolling motor needs plus use one for the cranking battery. I'm pretty sure wiring them that way would alleviate the need for a Stealth charger as both batteries would charge under power.

Wish I never would have read this; trying to figure out how to wire in the BMS module to protect from under-voltage and over-voltage. Also, how are they installing all this into a marine size battery..........

[dspencer]

https://www.amazon.com/ISDT-Digital-.../dp/B07797N9BG
https://www.ebay.com/itm/4Pcs-Silico...st+cable&rt=nc

This is all you need to monitor the cells. These were both recommended to me by a guy who builds them for a living. Gem carts.
Just make sure the batteries are within .01 volts before you connect them.

[mgeod]

https://www.amazon.com/ISDT-Digital-.../dp/B07797N9BG
https://www.ebay.com/itm/4Pcs-Silico...st+cable&rt=nc

This is all you need to monitor the cells. These were both recommended to me by a guy who builds them for a living. Gem carts.
Just make sure the batteries are within .01 volts before you connect them.

Have you tried to make a battery?

[AllyFishing]

If you ask me a person is looking for trouble building a lithium battery by reading articles. I'm not insulting anyones intelligence here either. And I can see the expense to purchase, or at least for now anyway. Anyone owning a business knows how much money goes
into operating expenses now throw in a hazardous materials product and you've got an expensive product.

[K-DAWG]

Some more interesting information about Lithium battery building.

https://www.electriccarpartscompany....hium-Batteries

https://www.electriccarpartscompany....ies-Are-Better

[dspencer]

My interest was piqued when I read this article. It is about an LTO battery, slightly different than the lithium phosphate LifePo4 battery that is more commonly used.
He had the cells available to him and I got mine from him. These are simpler for experimenting in marine applications as you don't need a circuit for high and low voltage cut off. These batteries are able to be fully discharged without harm and their upper voltage limit is well above what chargers and alternators put out. https://www.thehulltruth.com/boating...my-boat-6.html

I have 48 of the 11ah cells and am acquiring the parts to put this together. Stay tuned.

[jasonmcfatter]

My interest was piqued when I read this article. It is about an LTO battery, slightly different than the lithium phosphate LifePo4 battery that is more commonly used.
He had the cells available to him and I got mine from him. These are simpler for experimenting in marine applications as you don't need a circuit for high and low voltage cut off. These batteries are able to be fully discharged without harm and their upper voltage limit is well above what chargers and alternators put out. https://www.thehulltruth.com/boating...my-boat-6.html

I have 48 of the 11ah cells and am acquiring the parts to put this together. Stay tuned.

Definetly interested in how how this turns out for you. Been curious about it

[joe@lithiumpros.com]

well all I have to say here is be careful these batteries are nothing to just play with.

[bassmasterffej]

I agree with JOE!

[K-DAWG]

well all I have to say here is be careful these batteries are nothing to just play with.

Thanks for this valuable addition of information to this thread...……………….

[dspencer]

http://www.scib.jp/en/about/index.htm

I can see ruining these by shorting them out but I am comfortable with these batteries. Using them with a regular alternator or marine charger and you are using them at well under their design maximums. 6 in series and they can be charged to 16 volts, well below anything they will see unless I end up trying to maximize them.
Look at the link above and see the tests they make with these cells. They won't cause a fire.

I did put together a single battery of 6 cells that were all 2.34 volts and the (14v battery). I read they had a very low internal resistance and could put out a ton of amps so I took my Cummins and hooked it up. The Dodge uses 2 group 65 batteries. The 11ah battery I had put together turned it over faster than the 2 year old batteries that were in the truck.
I'm still waiting to get my box and potting material and then I'll put them together to try to get two batteries. At 14.2 volts, hopefully the charge they will get, will have them at about 37.5ah. I can safely increase that to 44ah if I charge them to 15.6 volts.