BMS Lithium Battery Protection Circuit Board – 1S–5S 18650 LiPo Li-ion PCB Module for 10A–25A Applications

Protect Your Lithium Pack. BMS Protection for Every Cell Configuration.

These BMS (Battery Management System) protection circuit boards safeguard your 18650, LiPo, and Li-ion battery packs from overcharge, over-discharge, and short circuit damage. Available in 1S through 5S configurations for 4.2V to 21V battery packs at 10A to 25A ratings.

Key Benefits

• Overcharge Protection — Cuts off charging when cells reach maximum voltage
• Over-Discharge Protection — Prevents cells from dropping below safe minimum voltage
• Short Circuit Protection — Instantly disconnects on short circuit detection
• 1S–5S Configurations — Covers 4.2V (1S) through 21V (5S) battery packs
• 10A–25A Current Ratings — Suitable for a wide range of DIY battery and power tool applications

Whether you're building a custom battery pack, repairing a power tool battery, or designing a DIY energy storage system, these BMS boards provide the essential protection that keeps your lithium cells safe and your build reliable.

Frequently Asked Questions

Q: What does BMS stand for?
A: Battery Management System — a circuit that protects lithium cells from overcharge, over-discharge, and short circuits.

Q: What configurations are available?
A: Available in 1S (4.2V/10A), 2S (8.4V/10A), 3S (12.6V/25A), 4S (16.8V/25A), and 5S (21V/25A).

Q: Is it compatible with 18650 cells?
A: Yes — designed for 18650, LiPo, and Li-ion cell configurations.

Q: Can it be used for power tool batteries?
A: Yes — suitable for DIY power tool battery packs and replacements.

Q: What is the current rating?
A: 10A for 1S/2S configurations; 25A for 3S/4S/5S configurations.

SPECIFICATIONS

• Type: BMS Protection Circuit Board
• Configurations: 1S (4.2V), 2S (8.4V), 3S (12.6V), 4S (16.8V), 5S (21V)
• Current: 10A (1S/2S), 25A (3S/4S/5S)
• Compatible: 18650, LiPo, Li-ion
• Weight: 0.01 lbs / 0.005 kg