What am I missing? Deal or not?

[kmcintyre]

Ok, so I have to admit, I wasn't really good in my EE classes (I was a software/computer engineeer) and am so confused.

Here's the situation: I have a camper w/ an aging AGM. Want to switch to a LiFEPO4 battery. We don't draw much power (LED lights and occasional furnace fan; 3x / year). I'm thinking 50Ah might be enough but obviouls 100Ah is better .

After searching around, I don't see the savings in the DIY packs by the time you buy all the components but... I found this BMW battery module/pack for $200 w/o a BMS which is $150-ish. So what am I missing. This looks to be a 90Ah, 12v battery that I'd only have to add the BMS.

Am I missing something? Spec's not good? Is it different from a LiFEPO4 and just a plain LiON? I think I just answered my own question but will post anyway in case someone needs some LiON batteries or if someone has some great ideas on how I can find another solution.

Thanks!
Kevin
--------------------

12V BMW Li-ion Battery – BigBattery.com

bigbattery.com

Electrical Specifications

Pack Voltage: 8.4v – 12.84v

Cell voltage: 2.8v – 4.2v

Power: 1000 Wh

Capacity: 90 Ah (45ah + 45ah)

Total Cells: 6 cells

Cell Configuration: 2P 3S

BMS: Not included

Frame: Aluminium Welded

Physical Specifications

Length: 8.25 in

Width: 7 in

Height: 7 in

Weight: 22 lb

 

[Gazoo]

It's LI-ion. The voltage range for a Lifepo4 battery is 2.5 to 3.6. Is the battery used?

After searching around, I don't see the savings in the DIY packs by the time you buy all the components

That's far from the truth. For example you can get 4 prismatic Lifepo4 cells shipped from China for less than $200.00 and they are new. Spend another $100.00 on a BMS, battery case posts and wires and fuse and you have yourself a new battery for around $300.00 plus the satisfaction of building your own. Depending on the BMS a DIY can cost more but a DIY is still way less than a Battleborn for example.

 

[GMB]

Watch this video and decide if you want to be sleeping anywhere near a Lithium Ion battery pack.

 

[kmcintyre]

It's LI-ion. The voltage range for a Lifepo4 battery is 2.5 to 3.6. Is the battery used?



That's far from the truth. For example you can get 4 prismatic Lifepo4 cells shipped from China for less than $200.00 and they are new. Spend another $100.00 on a BMS, battery case posts and wires and fuse and you have yourself a new battery for around $300.00 plus the satisfaction of building your own. Depending on the BMS a DIY can cost more but a DIY is still way less than a Battleborn for example.

Thanks.... I'm finding those cells on alibaba and think I'll give it a shot!

 

[kmcintyre]

Watch this video and decide if you want to be sleeping anywhere near a Lithium Ion battery pack.

I wouldn't be sleeping much w/ all that worrying!

 

[kmcintyre]

I'm seeing some "options" on the BMS Will linked to. One is the bluetooth module which I want and a UART box (which I'm not sure what that is). Any ideas? Here's a link:

7.74US $ 10% OFF|Dykb Smart Bms 4s 12v 60a 80a 100a 120a Li-ion Lifepo4 Lithium Protection Board Balance High Current Bluetooth App Software Gprs - Battery Accessories & Charger Accessories - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

 

[Gazoo]

It's this one I think:

4s BMS 120a LifePo4 with M6 Threaded Terminals

Comes with M6 Threaded Terminals soldered to the board as shown. BMS For 4 cell, 12v volt Lithium-iron-phosphate DIY batteries 120 amp continuous charge or discharge current Low Temperature Chargin…

overkillsolar.com

The guy selling them is a member of this forum. It comes with the bluetooth module and you can add a USB module. Personally I would go with him as he will upgrade the wires on the BMS and install lugs all for an additional charge. And you have great support. I know it's more expensive than aliexpress but just sayin.

Also there is a new seller for batteries here. Buy at your own risk.....but I have a good feeling about him and will be purchasing cells from him soon. I will be getting either 4 280ah or 8 200ah cells. If interested contact him and see what he can do for you.

What are the main brands of LFP batteries sold in China

The largest battery manufacturers in China are CATL and BYD, both of which have very good quality, but CATL prefers NCM batteries and BYD prefers LFP batteries However, the shape of BYD's battery is not popular. People are more interested in the CATL shape of the battery. In addition to...

diysolarforum.com

Whatever you decide I feel you will be content knowing exactly what batteries you have. Lifepo4 are safe and will last a long, long time if cared for properly.

 

[kmcintyre]

It's this one I think:

4s BMS 120a LifePo4 with M6 Threaded Terminals

Comes with M6 Threaded Terminals soldered to the board as shown. BMS For 4 cell, 12v volt Lithium-iron-phosphate DIY batteries 120 amp continuous charge or discharge current Low Temperature Chargin…

overkillsolar.com

The guy selling them is a member of this forum. It comes with the bluetooth module and you can add a USB module. Personally I would go with him as he will upgrade the wires on the BMS and install lugs all for an additional charge. And you have great support. I know it's more expensive than aliexpress but just sayin.

Also there is a new seller for batteries here. Buy at your own risk.....but I have a good feeling about him and will be purchasing cells from him soon. I will be getting either 4 280ah or 8 200ah cells. If interested contact him and see what he can do for you.

What are the main brands of LFP batteries sold in China

The largest battery manufacturers in China are CATL and BYD, both of which have very good quality, but CATL prefers NCM batteries and BYD prefers LFP batteries However, the shape of BYD's battery is not popular. People are more interested in the CATL shape of the battery. In addition to...

diysolarforum.com

Whatever you decide I feel you will be content knowing exactly what batteries you have. Lifepo4 are safe and will last a long, long time if cared for properly.

Going to give it a shot if I can get in touch with the guy selling the batteries.