Li-ion battery protection 3S 10A

Product detailed description

The HX-3S-01 protection module monitors a set of three series-connected Li-ion or Li-pol cells (3S, 11.1 V) against overcharging, deep discharge, overload, and short circuits. It handles a continuous current of up to 10 A and, thanks to its compact dimensions of 50 × 16 mm, fits directly onto a cell in DIY battery packs made from 18650 cells for tools, LED lighting, robots, or backup power supplies. The module does not have a balancer, so assemble the pack using cells of the same type, capacity, and age, and charge them to the same voltage before connection.

Specifications:

• Board designation: HX-3S-01
• Control circuit: 8254AA
• Number of cells: 3S (3 Li-ion / Li-pol cells in series)
• Charging voltage: 12.6 V (max. 13 V)
• Maximum operating current: 10 A
• Protections:
  • overcharge protection: 4.25 V ± 0.05 V per cell
  • deep discharge protection: 2.54 V per cell
  • over-current protection: 12 A
  • against overload
  • against short circuit
• Cell balancing: no
• Quiescent current: < 6 µA
• Pins:
  • B−, B1, B2, B+: cell connections
  • P+, P−: common output for load and charger
• Operating temperature: −40 °C to +50 °C
• Dimensions:
  • Board: 50 × 16 mm
  • Thickness: 2.8 mm
• Suitable chargers:
  • Li-ion battery mains charger 3S 12.6 V 2 A
  • Li-ion battery mains charger 3S 12.6 V 4 A
  • LaskaKit PD-IP2326 charger 2–3S 1.5 A (via USB-C)
• For higher currents:
  • Li-ion battery protection 3S 20A
  • Li-ion battery protection and balancer 3S 40A
• Useful for pack assembly:
  • Battery interconnection nickel strip, 7 × 0.1 mm, 10 m
  • LED capacity indicator for 3S Li-pol / Li-ion batteries

Important wiring notice:

• Protection Activation: After connecting the cells, the voltage at the P+ / P− output is zero – this is not a fault. You can "start" the protection by briefly connecting a charger to P+ and P−. Repeat this every time you disconnect the cells from the protection module.
• Cell Connection Sequence: first B−, then B1, B2 and finally B+. Follow the reverse order when disconnecting.
• Load and charger are both connected to the same P+ and P− terminals. The charger must be designed for 3S Li-ion (CC/CV, 12.6 V).
• Not suitable for RC models and airsoft: these applications have peak currents of tens to hundreds of amps, which will cause the protection to disconnect the output. For higher currents, choose the 3S 20A or 3S 40A protection.

Important Notice and Safety:

• The user is responsible for the correct connection of cells and protection – check the polarity and terminal sequence before the first connection.
• Use only Li-ion / Li-pol cells with a nominal voltage of 3.6–3.7 V. This module is not intended for LiFePO4 (3.2 V).
• Charge only with a charger designed for 3S Li-ion with a voltage of 12.6 V; do not charge unattended.
• The protection does not balance the cell voltages – regularly check the voltage of individual cells.
• Do not short-circuit, mechanically damage, or expose the cells to heat, fire, or moisture.
• If a cell swells, smells, or overheats, stop using the pack immediately.
• Before disposal, insulate the contacts and take the pack to a battery collection point.

Package contents:

• 1× HX-3S-01 Protection Module - Li-ion Battery 3S 10A

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 their basic properties.