I. Overall Machine Performance Analysis
Electrical Power Performance
The machine operates at a standard working voltage of 36V, with a charging input voltage of 220V. A 110V version can be customized for overseas markets. Its rated power is 210W, and the no-load motor speed stays steady between 17,000 and 22,000 RPM, delivering powerful output. It sews thick materials such as double-layer laminated woven bags and coarse fiber gunny bags without skipped stitches or thread jams.
Equipped with 20 power lithium battery cells, the cell capacity can be customized for expansion. It maintains stable voltage output under continuous high-current discharge with minimal range loss when working outdoors in low temperatures.
The machine features a dual power supply system:
- Integrated battery mounting: The battery attaches directly to the machine for cable-free operation with no tangled wires.
- Separable waist-hung battery pack: An extension cord connects the main unit to a battery pack worn on the waist to reduce hand load, ideal for all-day outdoor packing. The two modes can be switched in seconds without any tools.
It adopts a single-line chain stitch structure, which delivers high tensile strength to prevent seam splitting during heavy stacking. The whole seam can be quickly opened by cutting one end of the thread, making it suitable for sealing feed bags, grain sacks, chemical particle bags and other packaging materials. The machine weighs 4.2 kg with an anti-slip ergonomic handle that reduces hand fatigue during long-hour operation. Its uniform package dimension is 29.3×21×28.3 cm, easy for storage and vehicle transport.
Working Condition Adaptability
It works fully independent of fixed power outlets, perfect for field grain purchasing, mobile logistics collection, multi-area warehouse packing and outdoor construction material sealing. Compared with Model 370-1 integrated lightweight version, its doubled cell count doubles continuous working time and greatly cuts downtime for recharging during heavy-duty packing.
A pre-reserved oil channel is built into the transmission structure for optional post-installation of an oiler, supporting high-frequency daily operation of over 8 hours. Custom voltages and power plugs are available to match power grid standards worldwide for domestic and export sales.
II. Heat Generation & Heat Dissipation (Thermal Resistance) Technical Explanation
Thermal Resistance Control of the Motor
The dedicated 36V brushed DC drive motor uses high-purity copper coils with low internal resistance, minimizing heat converted from power loss during operation. Multiple heat dissipation grooves on the motor housing expand air contact area to rapidly dissipate internal heat buildup under sustained high-speed rotation. Compared with low-spec motors, it generates far less surface temperature rise after long working hours and stays comfortable to hold.
Thermal Resistance Protection for Lithium Battery System
The 20 battery cells are arranged in separate groups with reserved gaps between each cell to avoid heat accumulation caused by tight stacking. A built-in temperature control module inside the battery pack automatically reduces output power once cell temperature exceeds the safety threshold to stop overheating and cell swelling.
During charging, temperature-controlled current limiting activates automatically under high ambient temperatures to lower charging current, reduce heat generation and extend the cycle life of lithium cells.
Heat Reduction for Transmission Components
Sewing machine oil can be applied to bearings and hook needle friction points to form an oil film that cuts metal friction thermal resistance and high temperatures from dry abrasion. Prolonged dry operation without lubrication drastically increases friction, raises machine temperature sharply, scalds operators and accelerates wear of needles and bearings. Adding dedicated machine oil every 6 hours of continuous use effectively controls overall heat generation.
III. Installation, Disassembly & Operation Specifications
Battery Installation & Mode Switching
- Direct mounting mode: Align the large-capacity lithium battery with the card slot on the rear battery compartment, push vertically until an audible click confirms locked installation. To remove, press the side latch and pull out the battery; the whole process takes less than 10 seconds.
- Separable waist-hung mode: Connect both ends of the matching extension cord to the main machine and battery pack respectively, then fasten the battery pack to the waist strap. The cord length is reserved sufficiently to avoid obstruction during movement. All connectors are foolproof to prevent reverse polarity insertion that could burn circuits, and no tools are required for assembly or disassembly.
Installation of Consumables & Maintenance Accessories
An oiler can be retrofitted onto the reserved interface on the machine body and fixed by tightening. Needles and threads are easy to replace: loosen the needle clamp screw to swap needles, and thread through the pre-designed thread guides for quick setup accessible to new operators.
Installation & Operation Prohibitions
- Do not modify motor or battery wiring privately; voltage alteration will cause circuit overload and excessive heat.
- Ensure the battery clicks fully into place; loose connection leads to poor contact and instant high-temperature current spikes.
- Never block the heat dissipation grooves on the motor housing, as blocked ventilation sharply raises thermal resistance and creates overheating failure risks.
- Remove the battery for separate storage during long idle periods to avoid continuous micro-discharge of the machine circuit.
IV. Product Summary
Model 370-2 large-capacity lithium battery bag sewing machine is a handheld sealing device specially designed for long-duration mobile outdoor packing scenarios. Its core strengths lie in three dimensions: performance, thermal temperature control and easy installation.
In terms of performance, the combination of 20 large-capacity lithium cells and a 36V high-power motor delivers dual power supply modes balancing flexible operation and ultra-long endurance. The single-line chain stitch fits most industrial packaging bags. For thermal resistance management, triple heat control solutions including motor heat sinks, spaced cell layout and lubrication friction reduction suppress machine heat generation, while built-in temperature protection guarantees safe all-day continuous work. The simplified assembly design allows tool-free mounting and disassembly of batteries, cables and maintenance parts, enabling fast switching between two power modes with a low operation learning curve.
Custom cell capacities and voltages are supported to meet global market demands. It outperforms plug-in Model 370 and low-capacity Model 370-1 in mobile and long-hour packing tasks, making it the optimal choice for logistics, agriculture, chemical processing and warehouse packing sites without fixed power supplies. Standardized regular lubrication and proper battery charging & storage practices reduce heat-related wear and greatly extend the service life of both the machine and lithium battery pack.