15-Cell 21700 Li-ion Battery Storage Box Case & BMS Protection Board Set for Makita 18V Compatible Tools

Build maximum-capacity, industrial-grade power tool battery packs with this 15-Cell 21700 Li-ion Battery Storage Box Case & BMS Protection Board Set. Engineered for extreme-runtime custom builds and heavy-duty battery repairs, this massive housing accommodates fifteen high-drain 21700 lithium-ion cells for unmatched power discharge and operating life on high-demand job sites. Designed for seamless docking on Makita 18V LXT interface platforms as well as Lomvum, Zhipu, Hongsong, and Jingmi tools, the kit includes a precision-molded PCBA Battery Management System (BMS) circuit board. The integrated control system actively guards against overcharging, deep discharge, short circuits, and thermal overload. Forged from high-impact, fire-retardant ABS polymer, it features spring-loaded latches, terminal contact plates, cell spacer matrix holders, and battery level indicator windows for complete DIY pack assembly.

Key Features

• 15-Cell 21700 Extreme-Capacity Matrix: Holds fifteen 21700 lithium cells to deliver maximum continuous current output and ultra-long job site runtime.

• Integrated PCBA BMS Protection: Intelligent circuit board prevents overcharging, over-discharging, short-circuiting, and thermal runaway.

• Broad Makita-Style Interface Fitment: Fits Makita 18V LXT tools alongside compatible Lomvum, Zhipu, Hongsong, and Jingmi equipment.

• Flame-Retardant ABS Impact Shell: High-tensile, heat-resistant outer casing shields internal battery cells from severe drops, heavy vibration, and job site wear.

• LED Power Status Indicator Support: Integrated cutout window and internal space for mounting visual battery level indicator lights.

• Complete DIY Assembly Hardware: Includes outer plastic casing, internal 21700 matrix spacers, nickel connector plates, screws, and BMS board.

Why Choose Our 15-Cell 21700 Battery Case Kit

Standard tool batteries drain too quickly under heavy torque applications like rotary hammer drilling, concrete cutting, or heavy angle grinding. This 15-cell 21700 DIY battery case kit combines massive cell storage capacity, smart BMS electronic protection, high-impact ABS drop resistance, and broad Makita 18V interface compatibility—giving your high-demand cordless tools, workshop gear, and DIY battery rebuilds an instant commercial-grade upgrade.

Perfect For

• Custom assembling ultra-high-capacity 18V/20V battery packs using premium 21700 lithium cells

• Rebuilding broken, melted, or worn high-output battery packs for Makita-interface power tools

• Running power-hungry cordless tools like circular saws, rotary hammers, blowers, and heavy grinders for extended shifts

• DIY electronics technicians, contractors, and battery repair specialists building custom power supplies

Specifications

• Type: 15-Cell 21700 Li-ion Battery Storage Box Case & PCBA BMS Circuit Board Kit

• Cell Compatibility: 15x 21700 Lithium-Ion Battery Cells

• Protection Features: Overcharge, Over-Discharge, Over-Current, Short Circuit, Thermal Safeguards

• Materials: Fire-Retardant ABS Polymer & High-Conductivity Copper PCB

• Tool Compatibility: Makita 18V LXT Interface, Lomvum, Zhipu, Hongsong, Jingmi

• Ideal Uses: Heavy-Duty Battery Rebuilding, Custom 21700 High-Output Assembly, Casing Replacement