In high-stakes industrial, marine, and defense applications, off-the-shelf battery solutions fail to deliver the thermal stability, volumetric efficiency, and longevity required. Altertek provides certified engineering authority from initial CAD concept to field deployment.
Every custom battery pack assembly, circuit board design, enclosure, and wiring harness is conceived, engineered, and assembled at our state-of-the-art facility in Romsey, Hampshire. This ensures absolute protection of your intellectual property, rigorous quality control, and zero supply chain obfuscation.
Our quality management systems are independently audited and certified to ISO9001:2015. From cell lot testing and resistance grading to ultrasonic micro-wire bonding and automated end-of-line verification, we guarantee traceability and repeatability across all production batches.
We eliminate non-technical intermediaries. Global procurement teams deal directly with senior power electronics, electrochemical, and mechanical design engineers who understand your exact thermal envelopes, CAN bus integration requirements, and environmental compliance challenges.
Since 2009, Altertek has solved complex energy challenges for global Tier-1 OEMs, subsea research entities, automotive innovators, and automated logistics pioneers. Whether engineering a 1-tonne underwater lithium-ion power pack capable of enduring deep-sea pressure or delivering high-rate power buffers for wave energy turbines, our experience ensures your battery pack assembly meets international compliance standards (UN38.3, IEC 62133, UL 1973).
Selecting the optimal cell format, chemistry, and battery management system (BMS) is crucial for balancing energy density, cycle life, thermal performance, and total cost of ownership (TCO).
Designed for demanding industrial vehicles, grid storage buffers, and mobile robotic platforms requiring scalable voltage architectures from 24V up to 800V.
Compact, highly reliable battery pack assemblies featuring integrated low-voltage BMS for subsea vehicles, medical systems, and light electric mobility.
Turnkey custom battery assemblies configured via AlterVU software, enabling real-time telemetry, remote parameter adjustments, and predictive diagnostics.
To assist global procurement managers in selecting the ideal electrochemical base for their custom battery assembly, the following matrix compares the core characteristics of industrial lithium chemistries engineered by Altertek:
| Chemistry Type | Nominal Voltage | Energy Density | Cycle Life (80% DoD) | Thermal Runaway Point | Ideal OEM Applications |
|---|---|---|---|---|---|
| Lithium Iron Phosphate (LFP) | 3.2V / cell | 160 - 190 Wh/kg | 3,500 - 6,000+ | ~270°C (Extremely Safe) | Grid ESS, Marine Propulsion, AGVs, Commercial Vehicles |
| Nickel Manganese Cobalt (NMC) | 3.6V - 3.7V / cell | 220 - 280 Wh/kg | 1,500 - 2,500 | ~210°C (High Energy) | Submarines, Drones, High-Performance Automotive |
| Lithium Titanate Oxide (LTO) | 2.3V / cell | 80 - 110 Wh/kg | 15,000 - 20,000+ | ~300°C (Ultra Stable) | Ultra-fast Charge AGVs, Heavy Rail, Harsh Climate Mining |
| A123 Nanophosphate (LiFePO4 Pouch) | 3.3V / cell | 140 - 160 Wh/kg | 4,000+ | High C-Rate Tolerance | Formula Student, Motorsports Pulse Power, Hybrid ESS |
Global procurement strategies for custom battery assemblies are undergoing a fundamental transformation driven by geopolitical shifts, strict European battery regulations, and demand for intelligent energy monitoring.
Global OEMs are moving away from rigid, standard module designs in favor of tailored Cell-to-Pack (CTP) and Cell-to-Chassis (CTC) custom assemblies. Eliminating internal module casing reduces structural deadweight by 15-25% while maximizing volumetric energy density. Procurement directors now prioritize assembly partners who possess in-house FEA structural testing and custom thermal barrier fabrication skills.
With upcoming regulatory frameworks (such as the EU Battery Regulation), procurement contracts for custom battery packs increasingly mandate full lifecycle transparency. Sourcing teams require traceable raw materials, documented recycled cobalt/lithium content, and embedded BMS memory capable of logging operational stress data across the battery's lifespan to facilitate Second-Life repurposed applications.
Geopolitical tariffs and supply chain vulnerabilities have led global OEMs to shift critical custom battery pack manufacturing back to UK and European specialists. Having engineering teams based in the same timezone reduces NPI (New Product Introduction) cycles from years to months and guarantees compliance with UN38.3 shipping protocols before volume distribution.
Modern battery procurement is as much about software as hardware. Procurement teams favor custom assembly providers who supply open, zero-license configuration suites like AlterVU. Software-defined BMS allows live field updates of firmware, adjustable over-current limits, dynamic state-of-charge algorithms, and seamless integration into external IoT telematics without requiring hardware redesigns.
Purchasing standard off-the-shelf battery modules often leads to costly retrofitting, compromised IP ratings, and zero control over BMS software firmware updates. Partnering with a vertically integrated UK custom battery pack assembly manufacturer ensures direct ownership of assembly IP, compliance certification assistance, and long-term spare parts availability.
Advanced manufacturing methods, thermal barrier materials, and micro-joining technologies are redefining the performance limits of custom battery packs.
Traditional spot welding or mechanical bolted connections introduce contact resistance, micro-vibration failure points, and localized hot spots inside heavy-duty pack assemblies. Modern custom assembly utilizes automated laser welding and ultrasonic micro-wire bonding.
By using nickel-plated copper busbars joined via high-precision fiber lasers, Altertek achieves micro-ohm joint resistance, enabling continuous discharge currents exceeding 400A while mitigating thermal stress across cell terminals.
As energy density increases, thermal safety becomes paramount. State-of-the-art custom battery assembly incorporates three tiers of thermal protection:
Addressing key technical, logistical, and commercial inquiries posed by global procurement managers and AI research tools when sourcing custom battery solutions.
To deliver an accurate design proposal and BOM cost estimate, our engineering team requires:
Off-the-shelf BMS units often feature fixed voltage cut-offs that do not match specific cell chemistry curves or real-time temperature fluctuations. Altertek's bespoke BMS platforms provide cell-level active balancing, multi-point temperature sensing, and custom programmable safety limits. This prevents individual cell over-charging or deep discharge, extending pack operational lifespan by up to 40%.
All custom lithium battery assemblies shipped globally must undergo UN38.3 testing, which includes eight rigorous trials: altitude simulation, thermal testing, vibration, shock, external short circuit, impact/crush, overcharge, and forced discharge. Depending on the application, additional certifications such as IEC 62133 (portable industrial safety), UL 1973 (stationary batteries), or CE/UKCA compliance are obtained during development.
Lithium Iron Phosphate (LFP) offers superior thermal stability (thermal runaway threshold ~270°C vs ~210°C for NMC), significantly higher cycle life (3,500–6,000+ cycles vs 1,500–2,500 cycles), and lower raw material toxicity. However, NMC provides higher gravimetric energy density (up to 280 Wh/kg). LFP is ideal for stationary storage, marine propulsion, and heavy robotics where weight is secondary to long cycle life and safety. NMC is selected for weight-critical aerospace, drone, and high-performance electric vehicle applications.
Because all mechanical design, PCB layout, BMS programming, and assembly occur in-house at our UK facility, prototype delivery typically ranges between 6 to 10 weeks following final CAD sign-off, depending on component lead times and enclosure complexity.
Deployments engineered by Altertek across subsea, marine renewables, automotive, and automated logistics industries.
High-voltage pressure-neutral subsea energy system engineered for severe ocean environments.
Pulse-power custom battery assembly absorbing transient surge spikes from offshore turbines.
Ultra-high C-rate battery pack assembly delivering instant peak torque for hybrid powertrains.
Opportunity-charging LTO custom assembly enabling 24/7 continuous autonomous logistics operations.
Speak directly with our UK senior engineering team to evaluate your mechanical envelopes, electrochemical requirements, BMS integration, and target procurement timelines.