BMS With No Cell Level Over-Discharge or Over-Charge Protection - FYI/Warning

[JeepDaddy]

I don't want this to sound like a rant, but hopefully this information will help people. I purchased and tested this 4S 200A LifePo4 BMS. The specifications state there is an over-discharge protection at 2.5 +-.1 volts. During testing, I had a cell at 2.2v and dropping like a rock. The BMS did not shut off so I terminated the test. I inquired with the seller. The seller said this BMS only protects against the total voltage being under 10v or over 14.6c. That is total voltage of a 4 cell pack. It does not offer protection at the individual cell level per the seller. Multiple sellers advertise the same specs, so I'm not going to call out the actual seller. I'm going through the dispute process with Paypal right now due to my cells arriving two months after the BMS which delayed my testing past the Aliexpress dispute window.

Just an FYI if you are considering this BMS.

 

[MisterSandals]

LifePo4

The first clue should be that they don't realize that this is gibberish.

 

[Steve_S]

Name & Brand of Product, link to vendor and/or product.
Photo like that does not tell anyone name, brand, model or anything.

 

[JeepDaddy]

Name & Brand of Product, link to vendor and/or product.
Photo like that does not tell anyone name, brand, model or anything.

200A BMS

Not the vendor I used, but the same BMS