30-Cell 18650 Li-Ion Battery Housing & BMS Protection Board Set

30-Cell 18650 Li-Ion Battery Shell & PCB Protection Circuit Board Set

This all-in-one 30-cell 18650 lithium-ion battery housing and BMS protection circuit board set is purpose-built for experienced hobbyists and technicians who repair, rebuild, or assemble custom battery packs compatible with Mak-style chargers. The kit includes the plastic shell housing and a multi-stage Battery Management System (BMS) board — batteries are not included.

Made in Mainland China.

Whether you're rebuilding a power tool battery pack or assembling a custom Li-ion power solution, this set gives you a robust, feature-rich foundation with externally adjustable temperature and overcurrent parameters.

Key Features

• High-Temperature Charge/Discharge Protection — Automatically guards against overheating during both charging and discharging cycles, with low-temperature charging protection included.
• Externally Adjustable Temperature Parameters — Fine-tune temperature thresholds without opening the board.
• Overcharge Detection Protection — Prevents individual cells from exceeding safe voltage limits during charging.
• Overdischarge Detection Protection — Cuts off output before cells are drained below safe thresholds.
• Three-Stage Overcurrent Protection — Multi-level current monitoring for comprehensive circuit safety.
• Adjustable Overcurrent Delay (Stages 1 & 2) — Externally configurable delay settings for the first and second overcurrent protection stages.
• Battery Disconnection Protection — Detects and responds to unexpected battery disconnection events.
• NTC Resistor Disconnection Protection — Ensures safe shutdown if the NTC temperature sensor becomes disconnected.
• Short Circuit Protection — Immediate shutdown triggered by short circuit conditions.
• Mak Charger Compatible — Designed to work seamlessly with Mak-series chargers.

Specifications

Assembly & Usage Precautions

• This product is a component kit — battery cells are not included. Intended for users with hands-on battery assembly knowledge and experience.
• Double-check all battery lead and sampling point connections before powering on. Reversed connections may damage the BMS board.
• Do not allow the BMS board to make direct contact with the surface of battery cells during assembly.
• All soldering equipment must be reliably earthed/grounded. Use anti-static precautions throughout.
• Keep lead wires and soldering irons away from circuit board components to prevent accidental burns to the PCB.
• Store and use in dry conditions — protect from moisture, water, and static electricity.
• If there is no voltage output on initial power-on after assembly, activate the pack using a dedicated compatible charger before assuming a fault.

Please Note

• Product images are for reference only; please refer to the specifications above for exact dimensions.
• Minor measurement variations (±1–2 mm) may occur due to manual measurement.
• Color may vary slightly from photos depending on your monitor settings.

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Frequently Asked Questions

Q: Are the 18650 lithium batteries included with this 30-cell battery housing set?

A: No, the 18650 lithium-ion battery cells are not included. This set contains the plastic battery shell housing and the PCB Battery Management System (BMS) protection circuit board only. You will need to source and install 30 × 18650 Li-ion cells separately.

Q: Is this 18650 battery housing compatible with Mak chargers?

A: Yes, the PCB protection board included in this set is designed to be compatible with Mak-series chargers. After assembling your battery pack, use a dedicated Mak-compatible charger to activate the pack on first use if no voltage output is detected immediately.

Q: What protection functions does the BMS circuit board provide?

A: The BMS board features nine protection functions: high-temperature charge/discharge protection, low-temperature charging protection, overcharge detection, overdischarge detection, three-stage overcurrent protection with externally adjustable delay settings, battery disconnection protection, NTC resistor disconnection protection, and short circuit protection — making it a comprehensive safety solution for DIY 18650 battery pack assembly.

Q: Who is this 30-cell Li-ion battery housing set designed for?

A: This kit is intended for experienced electronics hobbyists, battery repair technicians, and DIY builders who have practical knowledge of lithium-ion battery assembly and BMS wiring. It is not recommended for first-time builders without prior battery assembly experience.