BMS protection and balancing board for Li-ion 6S–10S 15A

Product detailed description

BMS protection board for Li-ion and Li-pol cell assemblies 3.7 V in 6S to 10S configuration. It protects the battery from overcharging, over-discharging, overcurrent and short circuits, thereby extending its lifespan. The board operates with a common port – both the charger and the load are connected to a single common P− terminal, simplifying integration into e-bikes, scooters, power banks or backup power supplies. The continuous discharge current is 15 A, with protection triggering at 40 A. Each cell is monitored individually via balance leads.

Specifications:

• Cell type: Li-ion / Li-pol, 3.7 V (nominal)
• Number of cells: 6S–10S (depending on the selected variant)
• Port type: common (Common) – charging and discharging via the P− terminal
• Currents:
  • Continuous discharge current: 15 A
  • Continuous charging current: 8 A
  • Overcurrent protection during discharge: 40 A
  • Charging current protection: 10 A
• Voltage protections (per cell):
  • Overcharge protection: 4.25 V ±0.025 V
  • Overcharge recovery: 4.15 V ±0.05 V
  • Under-discharge protection: 2.7 V ±0.05 V
  • Under-discharge recovery: 3.0 V ±0.1 V
• Variants and maximum charging voltage:
  • 6S: 22.2 V nominal, max. 25.2 V
  • 7S: 25.9 V nominal, max. 29.4 V
  • 8S: 29.6 V nominal, max. 33.6 V
  • 9S: 33.3 V nominal, max. 37.8 V
  • 10S: 37 V nominal, max. 42 V (suitable for 36V e-bikes)
• Temperature protection: no (this version is without a temperature sensor)
• Dimensions:
  • Board: 60.5 × 32.5 × 9 mm
• Weight: approx. 53 g

Wiring (Common Port):

• B+ – main battery positive terminal (positive of the highest cell)
• B− – main battery negative terminal (negative of the first cell)
• P− – common negative for both charger and load
• Balance Connector – connect individual cells sequentially from the battery negative (cell 1) to positive (cell 6–10) according to the markings on the board
• The positive terminal of both the charger and load is connected directly to B+ – only the negative is routed through the board

Package contents:

• 1× BMS Protection Board (according to the chosen variant)

Important Notice and Safety:

• Always choose the variant that exactly matches the number of cells in your battery. The board cannot be reconfigured for a different number of cells.
• Never use the board for LiFePO4 cells – the voltage levels are set for Li-ion and Li-pol 3.7 V, and LiFePO4 cells would be damaged.
• Connect the balance leads sequentially starting from cell 1 (closest to the battery minus) – swapping the wires may lead to the destruction of the board or the cells.
• Before the first connection, check that all cells have approximately the same voltage (difference up to 0.05 V). Do not assemble batteries with cells that have significantly different voltages.
• Use only a charger with a voltage corresponding to the chosen variant. Higher voltage can cause overcharging, overheating, or even fire.
• The board does not have temperature protection – ensure sufficient cooling at high currents and do not cover it.
• Never use damaged, swollen, or mechanically stressed cells.

Note:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustrative purposes only and may sometimes differ from the actual appearance of the item. However, this does not change its basic properties.