The engineering behind every pack
Cell chemistry, BMS firmware, thermal management, and certification — engineered in-house. Five areas, scroll or jump.
Cell Chemistry Selection
We match the chemistry to your application — cycle life, energy density, safety profile, cost, and temperature range. Five chemistry families in production.
LFP (Lithium Iron Phosphate) — The workhorse of stationary storage and motive power. Inherently safe olivine-structure cathode that eliminates thermal runaway risk at the cell level. 4,000–6,000+ cycle life at 80% DOD, with field data on some deployments exceeding 8,000 cycles. Energy density of 160–180 Wh/kg is lower than nickel chemistries, but the longevity, safety margin, and cost per cycle are unmatched. Flat discharge curve simplifies SOC estimation. Operates reliably from -20°C to 60°C with appropriate thermal management. Applications: stationary ESS, motive power (forklifts, AGVs), marine, telecom backup, residential and commercial storage.
NMC (Nickel Manganese Cobalt) — Higher energy density (200–270 Wh/kg) for weight and volume-sensitive applications. NMC811 maximizes energy; NMC622 and NMC532 trade energy for cycle life and thermal stability. 1,000–2,000 cycle life depending on variant and duty cycle. Higher continuous C-rate capability than LFP. Preferred chemistry for e-mobility, portable industrial equipment, power tools, and space-constrained designs. Requires tighter thermal management and more conservative BMS limits than LFP.
NCA (Nickel Cobalt Aluminum) — Maximum energy density (250–300 Wh/kg) with high power capability. Aluminum doping stabilizes the cathode at high nickel content. Used where weight is the non-negotiable design constraint — high-performance e-mobility, aerospace-adjacent applications, and specialty equipment. Requires the most rigorous thermal and BMS design of the lithium chemistries.
Sodium-Ion (Na-Ion) — 30% lower material cost than lithium chemistries. No lithium, no cobalt, no nickel — sodium is abundant and geographically diverse. Production-ready since 2024 with multiple cell formats now in volume. Energy density (120–160 Wh/kg) trails LFP, but low-temperature performance down to -30°C, inherent safety, and lower raw material exposure make it a strong fit for cost-sensitive stationary storage, back-up power, and low-voltage motive applications.
Semi-Solid-State — Bridges conventional liquid-electrolyte lithium-ion and true solid-state. Gel or polymer-based electrolyte dramatically reduces electrolyte volume, improving safety margin and enabling higher energy density (up to 350+ Wh/kg at cell level). Limited production availability — we evaluate semi-solid-state on a per-program basis where energy density is the controlling design variable and volumes align with supply.
Battery Management Systems
The BMS is the intelligence layer that determines pack safety, performance, and lifespan. We engineer the hardware and firmware for your application.
Cell Balancing — Active vs. Passive — Passive balancing bleeds excess energy from higher-voltage cells as heat through balancing resistors. Simple, low-cost, and the right call for low-to-moderate energy packs where the thermal budget allows it. Active balancing shuttles energy between cells using inductive or capacitive transfer, recovering 5–10% of usable pack capacity and meaningfully extending cycle life on large or high-duty packs. We specify the balancing approach based on pack energy, thermal envelope, and whole-life cost — not on a blanket preference.
Protection Architecture — Multi-layer protection with independent hardware and software shutdown paths. Cell-level monitoring for over-voltage, under-voltage, over-current (charge and discharge), short circuit, and over/under-temperature, with separate first-level warnings and second-level hard faults. Pack-level fault handling uses redundant contactor control, pre-charge circuits on high-voltage packs, and galvanic isolation on the comms bus. All thresholds are configurable per program and locked via firmware signing before release.
Communication Protocols — CAN 2.0A/B and CAN FD with custom DBC files. J1939 for heavy-duty motive and industrial equipment. RS485 and RS232 for legacy industrial integration. Modbus TCP and Modbus RTU for ESS and SCADA environments. Ethernet and MQTT for cloud telemetry and fleet-level monitoring. Every program ships with a documented interface spec — not a generic protocol sheet.
Firmware Development — Application-specific firmware, written in-house. Charge and discharge profiles tuned to your duty cycle. SOC and SOH algorithms calibrated against real cell data, not datasheet curves. Fault thresholds, balancing triggers, and communication mappings all set per program. OTA update capability available on connected systems. Firmware aligned with UL, IEC, and NFPA expectations and reviewed against functional safety principles before release.
Production & QA
Our production operations run to ISO 9001, ISO 14001, and IATF 16949. Every cell, module, and pack we build is tested against your specification before it leaves the line.
Incoming Material Inspection — Cathode powder, anode material, separator, electrolyte, current collectors, and hardware are all inspected on arrival. Purity, particle size, moisture content, and specification compliance verified before any material enters the production line. Every lot is logged against the raw-material traceability record. Material that fails incoming inspection is quarantined and dispositioned under a documented non-conformance procedure.
In-Process Statistical Process Control — SPC runs on every critical process parameter: electrode coating thickness, calendering density, tab welding pull strength, electrolyte fill volume, and formation-cycling capacity. Control charts flag drift before it becomes a defect, not after. Process capability indices (Cp, Cpk) are tracked per line per shift and reviewed weekly.
Outgoing Capacity Grading & Release — Every production lot is 100% capacity-graded. Internal resistance (IR) measured on every cell. Open-circuit voltage verified after the rest period. Cells are matched into groups with tight capacity and IR tolerance so module and pack performance is consistent across the production run. Full test reports — capacity, IR, OCV, visual inspection — ship with every order.
100% Lot Traceability — Every cell, module, and pack carries a serial number that traces back through every process step to the raw material lot. If a field issue surfaces twelve months later, we can identify the exact production date, operator, equipment, and raw-material batch.
Monthly Production Data Review — Production data, field returns, and warranty claims are reviewed monthly by production and engineering together. Any quality excursion triggers a formal root cause analysis. Corrective and preventive actions (CAPA) are tracked to closure with verification that the fix holds in production data.
Safety & Certification
UL 9540, UL 9540A, UL 1973, IEC 62619, UN 38.3, and DOT Class 9 — test planning, lab coordination, and final documentation all handled in-house.
UL 9540 — Energy Storage Systems — The system-level safety standard for stationary energy storage in North America. Covers the full ESS: batteries, BMS, power conversion, enclosure, and control. Required by most AHJs for building permit approval on commercial and utility installations. We run UL 9540 as a program — test plan, lab scheduling, deviation handling, and final certification package.
UL 9540A — Thermal Runaway Fire Propagation — The test method that characterizes how a single-cell thermal runaway event propagates through a module, unit, and installation. Results drive NFPA 855 installation requirements, spacing, deflagration venting, and suppression. Increasingly required on commercial and utility ESS projects; we plan 9540A testing early so the pack design and installation envelope align.
UL 1973 — Stationary & Motive Battery Systems — The product-level safety standard for batteries in stationary, auxiliary, light electric rail, and motive applications. Electrical, mechanical, and environmental test coverage. Note that UL 1973 is a product certification — it certifies a specific battery model to the standard; it is not a factory or facility certification.
IEC 62619 — Industrial Lithium Cells & Batteries — The international safety standard for secondary lithium cells and batteries in industrial applications. Required for many markets outside North America and increasingly referenced in U.S. projects alongside UL 1973. Covers electrical, mechanical, and environmental safety with a focus on industrial duty cycles.
UN 38.3 — Transport Safety — The transport-safety gate every lithium battery must clear before it can be shipped. Eight test sequences: altitude simulation, thermal cycling, vibration, shock, external short circuit, impact/crush, overcharge, and forced discharge. A UN 38.3 test summary ships with every consignment. We prepare and manage the testing program for every new pack design.
DOT Class 9 — Hazardous Materials Compliance — U.S. Department of Transportation Class 9 regulations for lithium batteries. Classification, UN-certified packaging, labeling, shipper's declarations, and emergency response documentation. 49 CFR compliance for domestic shipments; IATA DGR for air; IMDG for sea. All handled in-house so the shipment clears, the first time.
Logistics & Import
We deliver to your dock with a landed-cost quote, not a logistics problem. Hazmat, tariffs, and customs are all handled in-house.
Class 9 Dangerous Goods Management — Lithium batteries ship as UN3480 (standalone) or UN3481 (contained in or packed with equipment), Class 9. We prepare UN 38.3 test summaries, Safety Data Sheets, and dangerous goods declarations for every consignment. Mode-specific protocols for sea (IMDG), air (IATA DGR), and ground (49 CFR). Shipper's declarations signed by trained dangerous goods personnel.
UN-Certified Packaging — Packaging designed and tested to the performance level required for the cells, modules, or packs being shipped. Drop, stack, and vibration tested. Inner cushioning, non-conductive separation, and orientation-locked configurations. Packaging drawings and part numbers are engineered per program and held under configuration control, not improvised at the loading dock.
HTS Classification & Section 301 Tariff Management — Every pack, module, and cell is classified to the correct HTS code — not the most convenient one. Section 301 exposure is evaluated at quote time and mitigated where the pack configuration, classification, or supply structure allows. Duty drawback captured where it applies. You get a landed-cost number with the tariff already in it, before you commit.
Pre-Clearance Documentation — Commercial invoice, packing list, bill of lading, UN 38.3 summary, SDS, certificate of origin, and CPSC/FCC/EPA filings as required — all prepared before the shipment leaves origin. Licensed customs house relationships on both coasts. FDA, EPA, and CPSC compliance where the product touches those jurisdictions. Bond management for frequent importers.
8 to 12 Week Production Lead Times — Standard production lead times run 8 to 12 weeks from PO release, with weekly production updates against the schedule. Ocean transit adds 3 to 5 weeks; air is 5 to 7 days when the program requires it. Real-time shipment tracking and proactive delay notification.
Tell us what you need to build.
Send us your voltage, capacity, form factor, and duty cycle. We'll come back with a chemistry recommendation, a sample timeline, and a landed-cost number.