Browse In-Stock Designs
Start with a production-ready spec and modify chemistry, BMS, or form factor for your program.
US-based manufacturing partner · Tampa, FL · NDAA compliant
#1 US-Based
Lithium Battery Pack
Manufacturer.
Build A Battery is cell-agnostic and chemistry-agnostic. LFP, NMC, NCA, LTO, LiPo, Na-Ion — we engineer the right chemistry for your application, not the one we happen to stock. Partnering with Lithium Battery Company for US-based manufacturing in Tampa, FL, with a roadmap to 100% domestic sourcing by 2027.
394+In-stock designs
84,000sq ftTampa, FL facility
10+Lithium chemistries
300K+/yrAnnual unit capacity
UL 1642UL 2054IEC 62133UN 38.3CE MarkingRoHSREACHMIL-STD-810MIL-PRF-32565DO-160NDAA §889Buy American ActATEX / IECExDOT 49 CFRIATA DGRUL 1642UL 2054IEC 62133UN 38.3CE MarkingRoHSREACHMIL-STD-810MIL-PRF-32565DO-160NDAA §889Buy American ActATEX / IECExDOT 49 CFRIATA DGR
Chemistry selection
Lithium Battery Chemistry Engineering
for OEM & Defense Programs
Most battery suppliers lock you into one chemistry because that's what they stock. Build A Battery engineers across the full lithium and sodium-ion spectrum — matched to your exact application.
LFPNMCNCALTONMC 811Na-IonLiPoLMOLNMONMC-LMO
Safety & longevity
LFP
Lithium Iron PhosphateThe gold standard for stationary storage, telecom, and defense applications where cycle life and thermal stability matter most.
Build a battery ›- Nominal voltage
- 3.2V
- Cycle life
- 3,000–6,000
- Best for
- Safety & longevity
How it works
Custom Lithium Battery Pack Production
From Spec to Shipment in Four Steps
Browse 394 proven designs or build from scratch. Either way, you get a complete, production-ready battery pack specification.
Define Your Requirements
Enter envelope dimensions, voltage, capacity, chemistry, application type, and annual volume.
Algorithm Generates Spec
Calculate cell arrangement, S×P configuration, BMS, thermal solution, and compliance flags.
Submit RFQ for Production
Our engineering team reviews your program and provides a production quote.
Markets we serve
US-Manufactured Lithium Battery Packs
for Every Industry and Application
From tactical defense systems to industrial OEM platforms — certified, volume-production battery packs built in the USA.
Defense & Military
Ground vehicles, soldier power systems, tactical communications, and forward-deployed energy solutions built to MIL-STD-810 and MIL-PRF-32565.
UAV & Drone Programs
High C-rate cylindrical and LiPo packs engineered for maximum flight time, minimal weight, and rapid field replacement.
Telecom Infrastructure
LFP drop-in replacements for VRLA lead-acid backup systems at cell towers, data centers, and critical communications nodes.
AGV & Robotics
Opportunity-charge LFP packs for warehouse automation, autonomous guided vehicles, and industrial robotic platforms.
Autonomous Underwater
Pressure-tolerant AUV and ROV battery systems with custom form factors, depth ratings, and subsea connector interfaces.
Oil, Gas & Offshore
ATEX/IECEx-certified packs for hazardous-area instrumentation, subsea equipment, and offshore platform backup power.
Industrial OEM
Volume production partnerships with equipment manufacturers requiring certified, consistent battery packs at scale.
Aerospace
DO-160 compliant packs for aviation programs, satellite ground support, and airborne platform power systems.
Marine & Naval
IP68-rated packs for commercial marine, naval surface vessels, and undersea platforms requiring corrosion resistance.
Medical Devices
IEC 62133-certified packs for portable medical equipment, surgical tools, and patient monitoring systems.
Energy Storage (ESS)
Large-format LFP rack and container systems for commercial, industrial, and grid-tied energy storage programs.
Scientific Instruments
Precision packs for field-deployed analytical instruments, portable laboratory equipment, and research platforms.
Cell formats
Custom Battery Pack Form Factors
Cylindrical, Prismatic, Pouch, and LiPo
Your enclosure is fixed. Your voltage and capacity are fixed. We start with your constraints and select the optimal cell format.
18650
Cylindrical- Size
- 18 × 65 mm
- Capacity
- 2.0–3.6 Ah
21700
Cylindrical- Size
- 21 × 70 mm
- Capacity
- 4.0–5.5 Ah
26650
Cylindrical- Size
- 26 × 65 mm
- Capacity
- 4.0–6.0 Ah
4680
Cylindrical- Size
- 46 × 80 mm
- Capacity
- 20–25 Ah
Prismatic LFP
Prismatic- Size
- Custom
- Capacity
- 50–320 Ah
Prismatic NMC
Prismatic- Size
- Custom
- Capacity
- 30–200 Ah
Pouch
Pouch- Size
- Custom
- Capacity
- 5–100 Ah
Engineering depth
Full-System Lithium Battery Pack Design:
Cells, BMS, Housing, and Thermal Management
Cells are a commodity. The BMS, thermal management, protection circuitry, enclosure, and compliance pathway are where programs succeed or fail.
Battery Management System
Active/passive cell balancing, SOC/SOH estimation, CAN/SMBus/I2C communication, and multi-layer protection circuitry.
Thermal Management
Passive air, forced convection, liquid cold plate, immersion cooling, and PCM thermal buffering — matched to your operating environment.
Protection Circuitry
Fuse sizing, contactor selection, pre-charge circuits, GFDI for HV packs, and isolation monitoring for safety-critical applications.
Structural Engineering
IP-rated enclosures from ABS to anodized aluminum, MIL-STD-810 shock/vibe compliance, and pressure relief valve integration.
Performance Optimization
Cell grading and matching, busbar material selection, laser/spot-weld recommendations, and C-rate optimization per chemistry.
Compliance & Certification
UL 1642, UL 2054, IEC 62133, UN 38.3, CE, RoHS, REACH, DOT/IATA transport classification, and MIL-SPEC pathways.
Complete battery system solutions
Battery Management Systems & Lithium Battery Chargers
Engineered for Your Pack
Intelligent BMS for Every Pack Architecture
From integrated PCB designs to distributed master-slave architectures — active and passive balancing, CAN, SMBus, RS485, protection, and SOC/SOH estimation.
Explore BMS solutions ›Charging Solutions for Every Deployment
From compact bench chargers to multi-bay fleet stations — matched to your chemistry, voltage, environment, and operational profile.
Specify charging ›Production range
Lithium Battery Packs for UAV, EV, Marine,
Defense, and Energy Storage Systems
Standards & compliance
NDAA-Compliant Lithium Battery Packs
UL, IEC, MIL-STD-810, UN 38.3 Certified
Build A Battery maps your design to every applicable standard — and flags compliance gaps before they become program-stoppers.
Access the design tool ›UL 1642UL 2054IEC 62133UN 38.3CE MarkingRoHSREACHMIL-STD-810MIL-PRF-32565DO-160NDAA §889Buy American ActATEX / IECExDOT 49 CFRIATA DGR
Why Build A Battery
Why OEM Programs Are Moving
Lithium Battery Manufacturing Back to the USA
Build A Battery partners with Lithium Battery Company to manufacture battery packs in Tampa, FL — giving OEM and defense programs full traceability, consistent quality, and a single point of accountability from design to delivery.
- US-based manufacturing — Tampa, FL
- NDAA / Buy American Act compliant supply chain
- MIL-STD-810, UN 38.3, UL 2054, IEC 62133 pathways
- Full chemistry breadth — not locked to one supplier
- Volume programs from 500 to 300,000+ units per year