Cheap 4kwh LiFePO4 batteries from Battery Hookup

[Supervstech]

I’ve seen the Poz solution, and it appears fine. I might modify it, and instead of pressing on the tubing, I think I will flatten some, and wrap it around a steel pin the same dimension as the post, then drill a hole for a fastening bolt... similar to a battery cable.

 

[maxx123]

I am taking off the posts, going to bolt on the side instead, also bolting swivel caster wheels to the aluminum heat plate. piggyback my second on top of it. easier to roll than back-breaking carrying it.

maybe use it as a hotplate, eggs anyone

 

[nicpaige]

Does anyone have a tech sheet or a link to a manual for these BYD 24v batteries?

 

[maxx123]

Does anyone have a tech sheet or a link to a manual for these BYD 24v batteries?

I looked everywhere for information on these batteries (ghost Battery), the only information on BYD is on this site,

 

[nicpaige]

That's a little unsettling.

 

[HMR]

I looked everywhere for information on these batteries (ghost Battery), the only information on BYD is on this site,

Please see my earlier, pre-Thanksgiving posts, trying to find out anything about these Ghost batteries (good term). In summary, I contacted the BYD battery support group by email, got one email response denying that they have every built this battery, and after that repeated efforts to that email addressed failed to get a response at all. I talked to representatives of TechDirect for any spec sheets or information with the response being that they have no information. I talked with a Victron national sales representative because Victron has a partnership with BYD based on their new BYD-box 48 v batteries and he said he knows nothing about these 24 v BTD batteries nor does he have any contact with anyone from BYD group to ask. So after all of these dead-ends, I just gave up trying to find technical specs for these batteries. I hope someone else is more successful.

 

[nicpaige]

I believe these were advertised as BYD "copies".

 

[HMR]

Great minds think alike, getting rid of the posts and connecting to the side prefer bolts to sleeve. Not sure if I am going to leave the post, or cut them off at the corner. Also is the neg- backplate it looks like it also keeps the battery together. reason I mention that it goes to a narrow plate on the side. that is 1/3rd the size!!! Drilled out all the old bms connectors going to rivot in my own.
Also with Battery hookup selling a lot more of these right now, tempting, 12 hour drive, screw that, maybe in the spring or when they get more
With the flood of BYD batteries we should see some interesting Ideas I hope

Why would you and Picasso choose to cut and modify the bus bars of the battery rather than use Poz's method or mine with shims to make a secure attachment to the current battery posts? What's the advantage given that a previous post by KBWaldron stated that these bus bars are used to hold the soft sided battery cells together physically. Would you not risk ruining the entire battery?

 

[maxx123]

Please see my earlier, pre-Thanksgiving posts, trying to find out anything about these Ghost batteries (good term). In summary, I contacted the BYD battery support group by email, got one email response denying that they have every built this battery, and after that repeated efforts to that email addressed failed to get a response at all. I talked to representatives of TechDirect for any spec sheets or information with the response being that they have no information. I talked with a Victron national sales representative because Victron has a partnership with BYD based on their new BYD-box 48 v batteries and he said he knows nothing about these 24 v BTD batteries nor does he have any contact with anyone from BYD group to ask. So after all of these dead-ends, I just gave up trying to find technical specs for these batteries. I hope someone else is more successful.

Smiles, even the info on the label says in Chinese ghost battery Li-ion battery (LiCoO2) but are Lifepo4 go figure

 

[HMR]

Smiles, even the info on the label says in Chinese ghost battery Li-ion battery (LiCoO2) but are Lifepo4 go figure

Curiouser and curiouser! Given these facts, how to we know for sure the battery chemistry is indeed LiFePo4 and not Li-ion (LiCoO2)?

 

[maxx123]

Why would you and Picasso choose to cut and modify the bus bars of the battery rather than use Poz's method or mine with shims to make a secure attachment to the current battery posts? What's the advantage given that a previous post by KBWaldron stated that these bus bars are used to hold the soft sided battery cells together physically. Would you not risk ruining the entire battery?

Not sure if you have the battery, I agree with the backplate holding it together, as to running 40" of bar to a neg post when I can have easier access on the same side and just make 4 holes and bolt in the cable instead of going through the trouble of making something that sticks out even further.
I void the warranty oh well, lol.
plus the bms board terminal on Poz clip seems interesting I am just doing a 8s bluetooth slapped in the same place as BYD bms was located, fan should keep it cool.

 

[Refinished]

There is this ebay auction for a similar looking article, which has a spec sheet of unknown origin.

 

[maxx123]

There is this ebay auction for a similar looking article, which has a spec sheet of unknown origin.

I think it is for only 149. each if you put down 50k their specs are just a little different. (They removed the specs) it could be the same supplier supplying Batteryhookup? just checking out their site maybe these batteries were backup to bitcoin servers, ran the servers using byd during the day, charged batteries at night.. of course a lot of that has gone bye bye boom to bust

 

[HMR]

There is this ebay auction for a similar looking article, which has a spec sheet of unknown origin.

Good job. So we can be sure they are indeed LiFePO4. The interesting part of this spec sheet to me is that max charge current is 120 A and max discharge current also 120 A. So does this mean to protect the battery we should fuse it for a maximum charge and discharge at 100 A at 24 V?
Edited addition: So I just checked the specs reported by batteryhookup on their sales page at;
https://batteryhookup.com/products/...sn=1727885.2bd9ce&_pos=2&_sid=7f0788887&_ss=r and the give charging rate as 2500 w, which at 25 v nominal is about 100 A and discharge rate as 5000 w or approximately 200 A. So the charge rate specs seem to be about 100 A max while the discharge rates are confusingly different.

 

[Refinished]

Good job. So we can be sure they are indeed LiFePO4. The interesting part of this spec sheet to me is that max charge current is 120 A and max discharge current also 120 A. So does this mean to protect the battery we should fuse it for a maximum charge and discharge at 100 A at 24 V?

To be clear, I don't trust this spec sheet! It looks thrown together using what little commonly available info i already out there on these. I added the link just as a puzzle peice. There has to be manufacturer supplied info out there somewhere.

 

[Refinished]

There is also this BYD doc that shows batteries with very similar cell construction on p11.

 

[Refinished]

I haven't seen any pics posted anywhere of the cells beneath the heat sink. I was wondering if I could just lose the heat sinks if I am going to be using/charging at a low C. The cells beneath are not cased, as far as I can tell, so that may be a bad idea.

 

[Picasso]

I dont think we are being told the full story on these batts...and yes all of them are coming from techdirectclub.com...that is also the ebay seller. My interactions with him/her/shim start with a sales pitch most time x batts x price, always hustling. I am happy to never have been in sales.

 

[maxx123]

Smiles, sales, the dark side. The specs on the byd batteries last week were different to battery hookup, now both sites do not show it.
Ghost battery

 

[maxx123]

I haven't seen any pics posted anywhere of the cells beneath the heat sink. I was wondering if I could just lose the heat sinks if I am going to be using/charging at a low C. The cells beneath are not cased, as far as I can tell, so that may be a bad idea.

I took mine apart too. With burnt wire rail bms board, figured better safe than sorry.
The heat plate must weight about 20 lbs
With the heat pad. Do not remove the strap.
Both my byd are bulging at the ends. Not flat.