Direct OEM/ODM industrial-grade lithium battery platforms engineered for marine propulsion, material handling, energy storage, and commercial fleets.
Deconstructing the transition from traditional lead-acid and AGM to high-density LiFePO4 and semi-solid-state chemistry for mission-critical B2B applications.
Standard BCI Group 31 battery enclosures (approx. 13 x 6.8 x 9.4 inches / 330 x 173 x 240 mm) historically yielded only 100Ah at 12V in lead-acid configurations with usable Depth of Discharge (DoD) capped at 50%. Advanced LiFePO4 custom manufacturing packs up to 12V 120Ah to 200Ah into the exact physical footprint—delivering over 2.5x usable energy without altering structural drop-in dimensions.
LiFePO4 (Lithium Iron Phosphate) exhibits extreme chemical stability due to its robust olivine crystal structure. With oxygen atoms tightly bound in covalent bonds to phosphorus, thermal runaway breakdown temperatures exceed 500°C (compared to ~210°C for NMC cells), guaranteeing zero fire hazards in enclosed marine hulls, commercial truck cabins, and industrial facilities.
Pioneering semi-solid-state electrolytes and integrated self-heating BMS thermal blankets eliminate low-temperature degradation. Custom Group 31 packs function reliably down to -40°C, maintaining high current discharge and preventing dendritic lithium plating during sub-zero fast charging operations.
| Performance Indicator | Legacy AGM / Lead-Acid Group 31 | Lithmate Standard LiFePO4 Group 31 | Lithmate Next-Gen Semi-Solid-State |
|---|---|---|---|
| Usable Capacity @ 100Ah Rating | 50 Ah (50% DoD limit) | 100 - 105 Ah (100% DoD) | 120 - 150 Ah (100% DoD Extended) |
| Weight (lbs / kg) | 65 - 75 lbs (29.5 - 34 kg) | 24 - 28 lbs (10.8 - 12.7 kg) | 18 - 22 lbs (8.1 - 10 kg) |
| Cycle Life (80% Capacity Retention) | 300 - 500 Cycles | 4,000 - 6,000+ Cycles | 6,000 - 8,000+ Cycles |
| Continuous Discharge Voltage Curve | Steep drop under load (12.8V down to 10.5V) | Flat 12.8V - 13.2V plateau until 95% depleted | Ultra-stable output voltage, zero sag |
| Total Cost of Ownership (TCO / kWh) | High ($0.45 / kWh per cycle) | Low ($0.04 / kWh per cycle) | Ultra-Low ($0.028 / kWh per cycle) |
While the initial CapEx of OEM Group 31 LiFePO4 batteries is higher than AGM legacy units, fleet operators save up to 68% over a 5-year lifecycle. Savings stem from reduced vessel/vehicle fuel burn due to a 60% weight reduction, zero routine maintenance, elimination of mid-season battery replacements, and fast-charging capabilities that reduce grid downtime in commercial material handling.
A global leader in custom lithium-ion battery pack manufacturing, operating under rigorous ISO 9001 quality management with Tier-1 cell sourcing and international compliance.
As a professional lithium battery manufacturer, our factory operates in full compliance with ISO 9001 standards, and all products meet multiple international safety certifications, including CE, UL, UN38.3, RoHS, and IEC. At Lithmate, we are committed to continuously advancing and improving lithium-ion battery pack technology.
Our factory is equipped with fully automated and semi-automated production lines, along with advanced battery testing equipment and R&D laboratories. This allows us to support the entire manufacturing process—from research and design to module assembly and final testing—with high efficiency and reliability.
Certified to meet international safety & transport standards.
Continuously upgrading & innovating lithium chemistry.
Robust supply chain serving international markets.
Custom BMS, casing, communication, & software.
Key market drivers shaping commercial fleet electrification, marine compliance, and industrial machinery energy standards across major global economic zones.
Modern B2B buyers require seamless communication protocols integrated into the BMS. Our Group 31 solutions feature CANbus 2.0B, NMEA 2000 (for marine systems), Modbus RS485, and Bluetooth 5.0 wireless diagnostics. This allows fleet management platforms to monitor real-time State of Charge (SOC), voltage balance, temperature matrix, and cycle counts remotely.
Commercial marine vessels and agricultural robotics demand IP67 or IP68 waterproof housings, flame-retardant ABS+PC alloy or stainless-steel enclosures, and potted internal electronics. Anti-vibration internal cell mounting structures withstand severe shocks up to 5G acceleration, meeting UN38.3 vibration and mechanical shock compliance.
Unlike standard deep-cycle batteries that fail under high surge current demands, custom Group 31 engineered packs combine extreme continuous discharge (100A-200A) with short-duration pulse cranking currents (1000A-1500A for 3 seconds). This dual capability powers heavy outboard marine engines while operating high-draw trolling motors and electronics simultaneously.
How Lithmate leverages China’s advanced lithium battery ecosystem, automated laser assembly, and top-tier cell partnerships to guarantee quality and cost advantages.
The foundation of any high-performance Group 31 battery lies in its cell quality. Lithmate exclusively integrates brand-new, Grade-A prismatic cells from CATL and EVE. Every incoming cell undergoes rigorous capacity sorting, internal resistance matching, and automated voltage grading before pack assembly. This ensures less than 5mV voltage deviation across all series cells, drastically extending total pack life.
Our 15,000m² Huizhou manufacturing facility utilizes automated robotic packing, ultrasonic wire bonding, and automated laser welding for minimal contact resistance. Every manufactured Group 31 battery passes 100% automated End-of-Line (EOL) testing, including dynamic charge/discharge cycle verification, BMS safety shutdown simulation, IP67 pressure testing, and high-voltage insulation tests.
Comprehensive commercial guarantee covering design & cell degradation.
Direct engineering support on BMS firmware & custom protocol integration.
Streamlined supply chain logistics ensuring rapid turnaround on OEM orders.
Engineered to power complex electrical systems across specialized sectors with tailored voltage, capacity, and terminal configurations.
Lithmate marine LiFePO4 batteries are engineered for bass boats, commercial fishing vessels, and electric yachts. Available in 12V, 24V, 36V, and 48V Group 31 footprints, they supply steady power for 36V trolling motors, sonar equipment, and onboard livewell pumps. Resistant to saltwater corrosion and heavy wave impact, these packs deliver all-day endurance without voltage drop.
Powering low-speed electric vehicles (LSV), utility carts, and personal mobility devices requiring high pulse discharge and fast charging capability. Custom battery management systems prevent over-discharge on steep inclines, while offering automated thermal protection during rapid charging cycles in warm summer environments.
Industrial forklifts, automated guided vehicles (AGVs), and floor sweepers require continuous 24/7 shift operations. Group 31 lithium modules support fast "opportunity charging" during operator break periods, eliminating battery swapping routines and hazardous acid-wash maintenance associated with lead-acid systems.
Providing exceptional Cold Cranking Amps (CCA) utilizing advanced sodium-ion and LiFePO4 chemistry options. Ideal for heavy-duty commercial trucks, emergency backup generators, personal watercraft (jet skis), and motorcycles operating in extreme climates from -40°C freeze up to +65°C desert heat.
Fully compliant with international transport safety standards and validated by leading global enterprises and government engineering centers.
Our products pass rigorous test protocols to guarantee compliance across worldwide customs and transport authorities:
Leveraging cutting-edge lithium battery technology, Lithmate holds over 100 patents across Battery Management Systems (BMS), module structural connections, and thermal dissipation systems. Host to the official Huizhou Energy Storage and Power Battery Engineering Technology Research Center, we collaborate with top universities for continuous electro-chemistry innovation.
Explore our specialized range of high-voltage energy storage systems, forklift traction packs, aerial work platform powerhouses, and wheelchair units.
In-depth engineering insights addressing high-intent queries from B2B buyers, fleet managers, and OEM integration engineers.
The Battery Council International (BCI) Group 31 physical standard specifies maximum dimensions of 13.0 inches (330 mm) in length, 6.8 inches (173 mm) in width, and 9.4 inches (240 mm) in height. Lithmate designs custom Group 31 packs to fit these exact dimensions while maximizing internal prismatic cell filling density to achieve 12V 100Ah, 120Ah, or up to 200Ah capacity ratings.
Yes. Lithmate custom Group 31 batteries feature high-current smart BMS architecture supporting up to 4 units in series (achieving 48V / 51.2V nominal systems) and up to 16 units in parallel for scaled capacity. Our BMS includes dynamic active cell balancing and reverse polarity protection to handle voltage differences during multi-pack connection.
Standard lithium charging below 0°C can cause metallic lithium dendrite formation, resulting in permanent cell degradation or internal short-circuits. Lithmate OEM Group 31 batteries feature integrated low-temp self-heating technology. When a charging current is detected under 0°C, the BMS directs energy to internal heating pads to raise the cell core to +5°C before initiating charging.
For standard Group 31 models, sample prototyping takes 7-10 business days. Full mass-production runs require 3-4 weeks. We support low-volume trial orders (MOQ starting at 10 to 50 units depending on customization requirements, including custom branded casing, Bluetooth app integration, and terminal locations).
Lithmate
