BMS 2S 3.2V 8A LiFePO4 / Lithium Battery Charge Protection Board 15A Peak Current 6.4V 18650 32650 Battery Packs.
 
The total charging voltage for a 2S (2-series) 3.2V LiFePO4 battery pack is 7.3V to 7.3V (or up to 7.3V–7.4V max), based on 3.65V per cell.
 
Key Technical Specifications
Nominal Voltage: 6.4V (2 cells × 3.2V)
Max/Full Charge Voltage: 7.3V (2 cells × 3.65V per-cell limit)
BMS Overcharge Protection Cutoff: Typically 3.65V to 3.75V per cell (approx. 7.3V to 7.5V total pack voltage)
Discharge Protection Cutoff: 5.0V total (2 cells × 2.5V per cell)
 
Connection Instructions
B+ (Battery Positive): Connect this terminal to the positive (+) anode of your battery pack.
B- (Battery Negative): Connect this terminal to the negative (-) cathode of your battery pack.
BM (Balance Middle): Connect this terminal to the junction point between Battery 1 and Battery 2 in your 2S series battery pack. This is for cell balancing.
P+ (Output Positive): This is the positive terminal for both charging input and load output. Connect your charger's positive output and your load's positive input here.
P- (Output Negative): This is the negative terminal for both charging input and load output. Connect your charger's negative output and your load's negative input here.
 
Resource:
1. User Manual