TDT NMC 1S-2AMP (Round) Hardware BMS

The TDT NMC 1S-2A Round Hardware BMS is a small battery protection and management board built specifically for single-cell (1S, nominal ~3.7 V) lithium-ion batteries such as 18650 or 21700 cells. It’s typically shaped in a round PCB format with pre-attached nickel tabs for easy spot welding onto cylindrical cells or compact battery packs.

Key Specifications

Cell Configuration: 1S (single Li-ion/NMC cell)

Nominal Voltage: ~3.7 V

Continuous Current Rating: ~2 A – suitable for low-power loads such as small LED modules, micro-controllers, and backup circuits.

Peak / Overcurrent Threshold: ~3 A (instant protection kick-in)

Protection Features:

Over-charge protection: disconnects if cell voltage exceeds ~4.25 ± 0.05 V

Over-discharge protection: cuts off when cell voltage drops below ~2.75 ± 0.05 V

Over-current protection: limits current above rated threshold

Short-circuit protection: rapid cutoff on fault conditions

Operating Temperature: Typically –20 °C to +60 °C

PCB & Form Factor: Round shape with nickel strips for welding directly onto cell terminals or battery tabs.