BMS 2 String 7.4V/10A

Hx‑2S‑JH20 Lithium Battery Charge Protection Board (2S, 7.4 V)

This protection board is designed for 2‑cell (2S) lithium‑ion or lithium‑polymer battery packs, with balance, charge/discharge protection, and built‑in safety features.

Technical Specifications

• Model: Hx‑2S‑JH20 (BMS/PCM module for 2S battery pack)
• Cell Configuration: 2 × 18650 (or equivalent Li-ion/LiPo) in series — rated 7.4 V nominal, 8.4 V fully charged
• Maximum Continuous Current: 10 A
• Maximum Pulse Current: 20 A (short-term)

Voltage Protection Thresholds

• Overcharge Protection: active at 4.25–4.35 V per cell (± 0.05 V)
• Overdischarge Protection: active between 2.5–3.0 V per cell (± 0.05 V)

Efficiency & Standby Characteristics

• Quiescent Current (Standby): < 10 µA
• Internal Resistance: < 300 mΩ
• Typical Lifespan: > 50,000 hours

Operating Conditions

• Operating Temperature: –40 °C to +50 °C
• Storage Temperature: –40 °C to +80 °C

Physical Details & Connections

• Dimensions: ~46.7 × 23 × 3.15 mm
• Connection Points:
  • B+ / B–: Battery positive and negative
  • MB: Tap for mid‑point connection (between cell 1 and cell 2)
  • P+ / P–: Charge/discharge positive and negative terminals (shared)

Intelligent Protection Circuitry

• Uses the HY2120‑CB protection IC (by HYCON Technology) for voltage/current monitoring
• Includes dual HY2213‑BB3A balancing ICs to equalize cell voltages during charging

Supported Battery Types

• Compatible with lithium-ion (Li-ion) and lithium-polymer (LiPo) chemistries
• Not suitable for lithium iron phosphate (LiFePO₄) cells

Spec Summary

• Model: Hx‑2S‑JH20 (2‑cell, 7.4 V BMS with balancing)
• Cell Configuration: 2 × 18650 Li‑ion/LiPo
• Continuous Current Rating: 10 A; Pulse Current: 20 A
• Overcharge Cut‑off: 4.25–4.35 V/cell ±0.05 V
• Overdischarge Cut‑off: 2.5–3.0 V/cell ±0.05 V
• Standby Quiescent Current: < 10 µA; IR: < 300 mΩ; Lifetime: > 50k h
• Operating Temp: –40°C to +50°C; Storage: –40°C to +80°C
• Dimensions: 46.7 × 23 × 3.15 mm; Weight: ~tbd
• Connections: B+, B–; MB (mid‑point); P+, P– (shared)
• Protection IC: HY2120‑CB; Balancers: 2 × HY2213‑BB3A
• Cell Chemistries Supported: Li‑ion, LiPo (not LiFePO₄)