Cutaway view of a six-rotor UAV with an OEM battery pack installed, exposing internal cell modules, wiring harness, ESCs and motor assemblies.
Custom OEM Drone Battery

Custom OEM Drone Battery Packs, Engineered to Your Airframe

Off-the-shelf batteries force your airframe to adapt to the pack. Custom OEM reverses that: the pack is engineered to your airframe — your voltage, your capacity, your form factor, your BMS, your connector, your certification requirements.

As a direct cell-to-pack manufacturer (not a reseller), WES controls the entire chain from cell production to final assembly. That single fact changes everything about cost, consistency, and speed for B2B buyers.

Pack-to-airframe integration: cell layout, harness routing and thermal path designed together — not adapted after the fact.
Why Custom

Why Build Custom Instead of Buying Off the Shelf

When the battery is designed around your airframe — not the other way around — you gain control over every parameter that matters.

Off-the-shelf drone battery packs vs. custom OEM packs from WES
Off-the-shelf pack Custom OEM with WES
Form factorFixed — you design around itEngineered to your airframe's cavity and CG
Voltage & capacityGenericExact voltage (3S–24S+) and capacity matched to motors
BMSStock BMS with limited commsBMS protocol integrated with your flight controller
ConnectorsStandardXT60 / XT90 / EC5 / AS150 / custom — your choice
Energy densityCompromiseSemi-solid, LiPo, or Li-ion selected for your mission
Supply chainNo controlCell-to-pack traceability, on-time fleet delivery
Customization Scope

What We Customize

Every parameter is yours to define. We engineer from the mission profile outward.

  • Chemistry. Semi-solid for heavy-lift and agriculture, high-rate LiPo for burst, Li-ion for endurance. We start from the mission and pick the cell that fits — not the other way around. See LiPo vs Li-ion vs Semi-Solid to understand the trade-offs.
  • Voltage and configuration. Any series/parallel layout, from compact 3S packs to industrial 24S systems. Our production line already covers 6S LiPo packs, 14S agriculture packs, and 24S 70Ah heavy-lift systems.
  • Form factor. Pouch, cylindrical, or prismatic — shaped and mounted to your frame, with your preferred mechanical interface.
  • BMS and communication. Smart BMS with SMBus, CAN, UART, or RS485 — fuel gauge, balancing, thermal protection, and telemetry integrated to your stack.
  • Connectors. XT60, XT90, EC5, AS150, JST-XH balance leads, or fully custom. Custom connectors are available on request.
  • Certification. UN38.3, IEC 62133, UL 1642, CE, CB, RoHS — validated as required for your target market.
OEM Process

The OEM Process

A mature program runs through five stages, each with clear deliverables:

  1. Requirement definition — mission profile, environment, volume forecast, target cost. We translate "we need 45 minutes at 20kg payload" into engineering specs.
  2. Engineering and design — cell selection, pack layout, thermal strategy, BMS selection, DFM review.
  3. Prototyping — functional samples for bench and flight testing, iterated until the pack meets your spec.
  4. Validation — cycle life, thermal abuse, vibration, and transport testing to your compliance targets.
  5. Mass production — tooling, in-line QC, and scheduled delivery to your build plan.
Technicians in blue uniforms assembling and inspecting custom battery packs along an automated cell-to-pack production line.
Cell-to-pack production under one roof: from electrode and cell assembly through pack integration and end-of-line QC.

Timeline: first samples typically arrive in weeks, depending on cell availability and BMS complexity. Fully custom form factors require additional tooling time.

MOQ and lead time depend on cell selection, tooling, and BMS. Semi-custom packs built from existing cells and tooling carry modest MOQs; fully bespoke form factors require higher volume commitments. Contact us with your target volume, and we will return a specific quotation.

Why WES

Why WES

Five reasons B2B buyers choose a direct cell-to-pack manufacturer over a reseller.

  • Direct manufacturer. We make the cells and the packs — no middlemen, no markup, full traceability.
  • Industrial-grade validation. Every program runs through cycle-life, thermal-abuse, and vibration testing beyond consumer standards.
  • Proven in the field. Production packs already power agricultural spraying, heavy-lift logistics, underwater robotics, and quadruped platforms.
  • Quality systems you can audit. IATF 16949-aligned processes and a full battery-certification portfolio.
  • Scale-ready. From pilot batches to fleet-scale volume, with on-time delivery.
A six-rotor agricultural spraying drone hovering over farmland, powered by a custom industrial drone battery pack.
Field-proven in agricultural spraying — where cycle life, discharge rate and thermal stability are measured in seasons, not spec sheets.

Representative production programs

Representative WES production programs by chemistry, configuration and application
Product Chemistry Configuration Application
66000mAh semi-solid Semi-solid23.7V 6S1PHeavy-lift logistics, agriculture
24S 70Ah industrial pack Semi-solid6048WhHeavy-lift UAV
14S 20Ah smart battery Smart Li-ion1064WhAgricultural spraying
6S high-discharge LiPo LiPo6S1PRacing, high-burst
FAQ

Frequently Asked Questions

You provide a mission profile and target specifications; we engineer a pack to your form factor, voltage, capacity, BMS, and connector, then build prototypes, validate them, and move to mass production. First samples typically arrive within weeks, depending on cell and BMS availability.
Yes. Voltage (3S to 24S+), capacity, physical form factor, BMS communication protocol, and connectors are all customizable. Connectors include XT60, XT90, EC5, AS150, and JST-XH, with fully custom options available on request.
Both depend on cell selection, tooling, and BMS complexity. Semi-custom packs built from existing cells and tooling have modest MOQs and weeks-long lead times; fully bespoke form factors require higher volume commitments and additional tooling time. Contact us with your target volume for a specific quotation.
Yes. We validate packs to UN38.3, IEC 62133, UL 1642, CE, CB, and RoHS as required by your target market, and we operate IATF 16949-aligned quality processes.
WES is a direct cell-to-pack manufacturer. We produce the cells and assemble the packs in-house, which gives you full traceability, better cost, and faster engineering turnarounds than a reseller can offer.
Start Your Program

Start Your Custom Program

You have defined the mission; now define the battery. Tell us your payload, flight time, operating environment, and target volume, and our engineering team will respond with a feasibility assessment and quotation. Or email Info@wesbattery.com.

The more detail you provide, the faster we can return a feasibility assessment and quotation.

Thank you — your enquiry has been submitted. Our engineering team will respond within 1–2 business days.