Chins responded to my email -
Questions:
Product = 12V LiFePO4 Deep Cycle Battery - 200Ah and 300Ah batteries that are listed on
amazon.com
1) Do these have a low voltage discharge shutoff in the BMS?
2) Do these have a low temperature cutoff?
3) What number of cells in the 200Ah and 300Ah?
4) What is the cell type/wiring for the 200Ahand 300Ah? IE: 300Ah = 8s 280Ah 3.2V in 4s2p
5) What cell balancing features does this battery include?
Answers from Chins:
1. The battery pack has a discharge low-voltage protection function. Generally, it will protect the board at 9.2-9.7V. We recommend that the inverter end over-discharge protection cut-off voltage is 10V.
2. When the battery pack is discharged below -20 degrees, the discharge low temperature protection is triggered, and when the battery pack is charged below 0 degrees, the charge protection is triggered. (The ordinary lithium iron phosphate battery does not have the low temperature protection function of charging,
Low temperature heating lithium iron phosphate battery has low temperature protection function) Please check our low temperature heating lithium iron phosphate battery:
https://www.amazon.com/dp/B08N56268P?ref=myi_title_dp
3. There are 8 3.2V100Ah batteries inside the 200Ah battery pack, 4S2P combination.
There are 8 3.2V150Ah batteries inside the 300Ah battery pack, 4S2P combination.
4. Our battery types are all lithium iron phosphate batteries with 25*2mm connecting pieces inside, and the output positive and negative wires are 2 6AWG wires connected in parallel to the copper terminals of the shell.
5. The battery pack has the function of passive charging balance.
Pros:
Price
Passive charge balancing
Cons:
9.2-9.7V cutoff that doesn't appear to work
No low temp cutoff in the non-heated version
Doesn't look like they are provide advertised capacity