Custom 18650 & 21700 Battery Packs for Power Tools
THOR Power provides factory-direct custom lithium-ion battery pack solutions for cordless drills, electric screwdrivers, saws, grinders, garden tools, cleaning tools, and portable industrial equipment. We support custom voltage, capacity, discharge current, BMS protection, housing, connectors, and long-term OEM/ODM supply.
Engineering Review for Power Tool Battery Pack Projects
Power tool battery packs are reviewed around tool power, high discharge current, voltage platform, 18650 / 21700 cell selection, BMS protection, housing structure and connector fit before sample development. The goal is to reduce sample revisions, avoid weak output, and improve battery pack fit before batch production.
Battery Pack Direction Matching
Voltage platform, load current, peak discharge demand, runtime target and tool structure are reviewed before recommending a battery pack direction.
From Tool Requirements to Sample Design
Samples can be developed around tool dimensions, housing space, connector interface, charging method and BMS protection logic.
Tool Power & Load Current Review
Tool power, high discharge current, peak current and stall current are reviewed to avoid voltage drop, weak output and overheating.
Voltage Platform Matching
Battery voltage is matched with common 12V, 18V, 20V Max, 24V, 36V, 40V and 48V power tool battery platforms.
18650 / 21700 Cell Selection
18650 and 21700 cells are compared by discharge current, capacity, pack size, weight, cost and long-term supply stability.
Series-Parallel Configuration
5S, 10S or project-specific S/P layouts are reviewed to match voltage, capacity, discharge ability, runtime and housing space.
BMS & Temperature Protection
BMS logic can include over-current, short-circuit, over-charge, over-discharge, balancing and NTC temperature protection.
Housing & Connector Fit
Housing size, socket position, terminal type, polarity, locking structure, wire output and charging interface are matched with the tool design.
Power Tool Battery Pack Applications
THOR Power supports custom 18650 and 21700 lithium-ion battery pack projects for cordless power tools, garden tools, cleaning equipment, outdoor lighting and portable equipment requiring strong output, stable discharge, BMS protection and long-term OEM/ODM supply.
Cordless Power Tool Battery Pack
Custom battery packs for cordless drills, rotary hammers, electric screwdrivers, cutters and other handheld power tools requiring stable torque output, high discharge current and reliable BMS protection.
Garden Tool Battery Pack
Lithium-ion battery pack solutions for lawn mowers, pruning shears, blowers, chainsaws, hedge trimmers and outdoor garden tools requiring longer runtime, durable housing, safe charging and stable batch supply.
Cleaning Equipment Battery Pack
Custom battery packs for vacuum cleaners, floor scrubbers, cleaning robots and portable cleaning equipment requiring balanced capacity, discharge performance, weight control and installation fit.
Outdoor Lighting & Portable Equipment Battery Pack
Custom battery packs for portable lighting, LED work lights, camping lights, outdoor equipment and small power devices requiring stable output, reliable runtime, connector matching and dependable long-term supply.
Need a Custom Battery Pack for Your Tool or Outdoor Equipment?
Send your voltage platform, load power, target runtime, discharge current, housing space, connector type and quantity requirements for engineering review.
Quality Control for Power Tool Battery Packs
From cell matching and pack assembly to BMS verification, high-current discharge testing, temperature check, housing inspection, packing, and shipment review, THOR Power checks custom power tool battery packs against confirmed project requirements before delivery.
Factory-Direct Pack Assembly Control
Quality checks cover cell matching, nickel strip welding, pack structure, BMS installation, wiring, terminal output, housing fit and final delivery review.
Sample-to-Batch Consistency
Approved samples, production batches, connectors, labels, packing and key electrical parameters are reviewed against confirmed project requirements.
Cell Matching & Pack Assembly Control
Cell voltage, capacity, internal resistance, pack layout, nickel welding quality, holder structure and assembly consistency are reviewed before pack testing.
BMS Function Verification
BMS protection functions are checked for overcharge, over-discharge, overcurrent, short-circuit, balancing, NTC temperature sensing and charging logic.
High-Current Discharge Testing
Discharge output, voltage drop, load current, peak current response, heating behavior and system power stability are tested before delivery.
Capacity & Runtime Check
Battery capacity, usable energy, runtime target, discharge curve and application load requirements are reviewed against project needs.
Connector, Terminal & Polarity Check
Terminal direction, connector output, wire length, polarity, socket position, charging interface and installation fit are checked before shipment.
Housing, Label & Shipment Review
Battery housing, locking structure, label information, warning marks, packing method, shipment documents and order details are reviewed before delivery.
Power Tool Battery Pack FAQ for Custom Design & OEM Sourcing
Answers to common engineering and sourcing questions about custom 18650 and 21700 power tool battery packs, including voltage platform, series-parallel design, discharge current, BMS protection, housing fit, sample testing, and long-term OEM/ODM supply.
How do I choose the right custom battery pack for a cordless power tool?
Start with the tool voltage platform, motor power, continuous working current, peak current, stall current, target runtime, battery compartment size, charging method, and connector structure. A suitable power tool battery pack should match the real load demand of the tool, not only the rated voltage or capacity. THOR Power can review these parameters before sample development and recommend a suitable 18650 or 21700 lithium-ion battery pack direction.
Should my power tool battery pack use 18650 cells or 21700 cells?
18650 cells are commonly used when the battery pack needs mature supply, compact size, flexible structure, and cost control. 21700 cells are often considered when the project needs higher capacity, stronger discharge performance, or longer runtime within a similar pack space. The final choice depends on tool current, available housing space, weight limit, cost target, and long-term supply plan.
How do you decide the series-parallel configuration for a power tool battery pack?
Series configuration determines the voltage platform, while parallel configuration affects capacity, discharge current, runtime, and heat performance. For example, 12V, 18V, 21V, 24V, 36V, 40V, and 48V power tool battery packs may require different series structures. THOR Power reviews voltage, motor demand, current output, battery size, cell selection, and BMS requirements before confirming the pack layout.
Why does a cordless tool battery pack shut down, lose power, or become hot during use?
Common causes include insufficient cell discharge capability, voltage drop under load, wrong BMS current limit, poor welding quality, high internal resistance, weak connector contact, blocked heat dissipation, or a battery design that does not match the real peak current of the tool. For high-load tools such as grinders, saws, hammers, and chainsaws, peak current and stall current must be reviewed carefully before production.
What BMS protection is needed for a custom power tool lithium battery pack?
A power tool battery pack usually requires overcharge protection, over-discharge protection, overcurrent protection, short-circuit protection, temperature protection, and sometimes cell balancing or NTC temperature sensing. The BMS should be selected according to working current, peak current, charger requirements, cell structure, and safety needs. If the BMS current limit is too low, the tool may stop during heavy-load use.
Can you customize the housing, terminal, connector, and locking structure for power tool battery packs?
Yes. THOR Power can review battery housing size, plastic case structure, terminal position, socket direction, polarity, wire output, charging interface, locking structure, and installation fit according to your tool design. For OEM/ODM power tool battery projects, mechanical fit is as important as voltage and capacity because poor fit can cause unstable contact, charging failure, or poor user experience.
Can you develop replacement battery packs for existing power tool models?
Yes. If you need a replacement battery pack for an existing cordless tool model, please provide the original battery voltage, capacity, battery photos, dimensions, connector or terminal details, charger information, and expected quantity. We can review whether the pack can be developed with a compatible housing, suitable cell configuration, BMS protection, and reliable charging interface.
What information should I provide for a custom power tool battery pack quotation?
Please send the required voltage, capacity or runtime target, tool type, motor power, continuous current, peak current if available, battery size or housing drawing, connector or terminal type, charging method, BMS requirements, label requirements, certification or shipping document needs, and estimated order quantity. More complete information helps reduce sample revisions and improves quotation accuracy.
How do you test power tool battery packs before delivery?
Testing can include cell voltage and internal resistance matching, capacity check, BMS function verification, charge and discharge testing, high-current load testing, voltage drop review, temperature behavior check, connector and polarity inspection, housing fit review, label inspection, packing check, and shipment document review. Approved samples and batch production requirements are checked before delivery.
Can THOR Power support long-term OEM/ODM supply for power tool battery pack projects?
Yes. THOR Power supports OEM/ODM power tool battery pack projects from engineering review and sample development to batch production and long-term supply. We can support custom voltage, capacity, cell selection, pack structure, BMS, housing, terminal interface, label, packaging, and shipping documents such as UN38.3 and MSDS according to project requirements.
Not Sure Which Power Tool Battery Pack Fits Your Project?
Send your tool voltage, motor power, discharge current, battery space, runtime target, connector type, charging method, and quantity requirements. THOR Power can review your project and suggest a suitable custom battery pack direction.