High-Reliability 3S Li-ion Packs Split Port Battery Protection Circuit Board PCB for Small Electronics

The ITL0030150046-01 is a compact, low-power-optimized protection board exclusively designed for 3-cell series (3S) lithium battery packs—compatible with Li-ion, Li-polymer, and LiFePO4 chemistries—with a maximum discharge current of 5A. Tailored for light-duty, mid-voltage applications (nominal 11.1V for Li-ion), it prioritizes precise safety control and minimal power consumption, making it an ideal choice for low-to-moderate load devices like small consumer electronics, IoT sensors, and portable mini-tools.

3S-Specific Protection & 5A Current Safeguards

Calibrated to address the unique needs of 3-cell configurations, the board delivers targeted protection aligned with 3S voltage dynamics and 5A low-power demands:

• Overcharge Protection: Triggers at 4.25V (Li-ion) per cell (total 12.75V for 3S packs), instantly cutting charging current to prevent cell swelling or electrolyte degradation—critical for 3S systems where even minor voltage imbalance between three cells can shorten battery life.
• Undervoltage Protection: Shuts down discharge at 2.5V (Li-ion) per cell (total 7.5V for 3S packs), avoiding irreversible capacity loss from "weak cells" that are particularly impactful in light-load devices relying on steady 5A output.
• 5A Overcurrent & Short-Circuit Protection: Blocks currents exceeding 5A (max discharge) or 15A (peak surge), shielding the 3S pack and connected devices (e.g., mini Bluetooth speakers, portable sensors) from burnout during accidental short circuits or temporary load spikes.
• 3-Cell Active Balancing: Automatically equalizes voltage across all three cells during charging, eliminating uneven charge distribution—a common issue in 3S packs that causes inconsistent performance in low-power devices. This extends battery lifespan by up to 25% compared to unbalanced systems and maintains stable 5A discharge.

Ideal Application Scenarios

This board is tailored for 3S lithium devices requiring 5A peak discharge:

• Consumer Electronics: 3S small Bluetooth speakers, handheld MP3 players, or mini portable fans;
• IoT & Sensors: 3S environmental monitors (temperature/humidity), Bluetooth beacons, or asset trackers;
• Light-Duty Gear: 3S mini RC toys (small cars, micro-drones), camping lanterns, or portable USB fans;
• Everyday Gadgets: 3S portable phone chargers (mini power banks) or handheld laser pointers.