BMS 2S ROUND

The HX-2S-A2 is a circular 2S BMS (Battery Management System) protection board for 2-cell series 18650 Li-ion packs (8.4V max). Provides overcharge, over-discharge, overcurrent, and short-circuit protection. Compact round form factor for cylindrical battery pack builds.

Note: Not compatible with LiFePO4 batteries or high-current loads (e.g. hand drills, e-bikes, 775 motors, 1W LEDs). If the battery heats up during use, the pack is mismatched — discontinue use immediately.

Pin Connections:

• B+ — Battery positive
• B− — Battery negative
• MB — Mid-point between cell 1 and cell 2
• P+ — Charge/discharge output positive
• P− — Charge/discharge output negative

Specifications:

• Model: HX-2S-A2
• Cell config: 2S (8.4V nominal)
• Overcharge detection: 4.25–4.35V ± 0.05V
• Over-discharge protection: 2.5–3.0V ± 0.05V
• Max working current: 5A
• Quiescent current: <10μA
• Internal resistance: <300mΩ