4S 20A 14.8V Cell 18650 Li-ion Lithium Battery Balanced Charging BMS PCB Board with Protection

The BMS 4S 4S 18650 Battery BMS 20A 14.8V-16.8V Charger Protection PCB Board is a Lithium-ion 18650 cell battery protection board. This BMS 4S is designed to protect your battery from over-discharge and over-charge, preventing battery damage and extending its lifespan.

Features:

• Compact and space-saving design.
• Simple and clear wiring for easy installation.
• Targeted protection for 4S Li-ion battery packs.
• Custom installation options available.

Parameters:

• Model: HX-4S-D20
• Voltage Range: 4.25~4.35V ±0.05V per cell
• Size: 35x35x3.6mm
• Overvoltage Range: 2.3~3.0V ±0.05V
• Upper Working Current: 10A
• Maximum Instantaneous Current: 20A
• Working Temperature: -40 to +50°C
• Storage Temperature: -40 to +80°C
• Static Current: Less than 30uA
• Effective Life: More than 50,000 hours
• Internal Resistance: Less than 100mΩ
• Short Circuit Protection: Yes, with charge recovery
• Charging Voltage: 16.8V-17V
• Controller: S-8254AA, connect 4pcs lithium battery at B+, B3, B2, B1, B-P+ and P- as output or input

Attention:
Please strictly follow the wiring diagram: 0V (B-), 3.7V (B1), 7.4V (B2), 11.1V (B3), 14.8V (B+). Avoid intentional short-circuits! After connecting, charge the battery before using. For 4-cell series packs, ensure each battery voltage is the same; charge separately if different. Mixing good and poor batteries can reduce performance.

Caution:
This BMS 4S cannot be used with lithium iron phosphate batteries, hernia lamp packs, hand drills, electric fish batteries, electric bicycles, children’s cars, or high-current motors above 4A. Discharge products above 3A should have a discharge ratio above 3C.

Multiplier Calculation Formula:
1C multiplier battery: 2000mAh capacity = 2A upper working current.
3C multiplier battery: 2000mAh capacity = 6A upper working current.
Avoid using batteries above the multiplier limit for long durations to prevent damage.

Application:

• Small power inverters
• Massager battery packs
• LED lamp backup power
• Electronic products
• Solar street lamp battery packs
• Monitoring and standby power supply

Looking for affordable BMS 4S? Check the BMS price in Pakistan to get the best deals for 18650 Li-ion battery protection boards.