// Battery Connectors

Battery Management System BMS 4-Pin

BMS 4-pin connectors connect the battery management system to external charging, discharging, and communication circuits. Common on 18650 battery packs providing overcharge, over-discharge, and short circuit protection.

// Specifications

Standard

Generic BMS 4-pin

Pin Count

Signals

B+ B- P+ P- (Battery and Protected terminals)

Function

Charge discharge protection balancing

Use Case

DIY 18650 packs e-bike batteries power banks

Note

B- and P- differ when BMS is active

// Pin Reference Table

Pin	Name	Function	Type
1	B+	Battery positive unprotected	PWR
2	B-	Battery negative unprotected	GND
3	P+	Protected positive output	PWR
4	P-	Protected negative output	GND