Weijiang Power provides end-to-end custom NiMH battery pack design and manufacturing services for OEM and ODM clients worldwide. From initial concept and cell selection to PCM design, enclosure tooling, mass production and certification, our engineering team handles every step. Whether you need a simple 4.8V AA pack for a consumer device or a complex multi-voltage industrial battery system, we deliver tailored solutions with consistent quality and competitive pricing.

Our Custom Design Process

Requirement Analysis: Share your device specifications, voltage, capacity, dimensions, discharge profile and operating environment. Our engineers review feasibility within 24 hours.
Cell Selection: Choose from AA, AAA, A, Sub-C, SC, C, D, F and 9V NiMH cells in various capacities (300–13,000 mAh) and discharge rates (standard to high-drain).
Pack Configuration: Design series/parallel arrangements to meet your exact voltage and capacity requirements. Common voltages: 2.4V, 3.6V, 4.8V, 6V, 7.2V, 8.4V, 9.6V, 10.8V, 12V, 14.4V, 18V, 24V and custom.
PCM & Electronics: Integrate protection circuit modules (PCM), NTC thermistors, fuel gauges, SMBus/I2C communication, charge control and LED indicators as required.
Connectors & Harness: JST, Molex, Hirose, custom connectors, bare leads, wire harnesses and terminal options to match your device interface.
Enclosure & Tooling: Heat-shrink wrap, PVC jacket, ABS/PC plastic enclosure (custom tooling available), epoxy potting and conformal coating for harsh environments.
Prototyping & Testing: Free evaluation samples within 7–10 days. Full testing: capacity, cycle life, high-rate discharge, temperature, vibration, drop and insulation.
Mass Production & Certification: Production lead time 15–25 days. CE, RoHS, REACH, UN38.3, MSDS documentation for global shipping.

Industries We Serve

Medical & Healthcare: Infusion pumps, patient monitors, diagnostic devices, portable medical equipment (ISO 13485 compatible processes available).
Industrial & IoT: Data loggers, measurement instruments, emergency backup power, UPS systems, smart meters.
Consumer Electronics: Cordless phones, two-way radios, portable speakers, home appliances, personal care devices.
Power Tools & Garden: Cordless drills, screwdrivers, trimmers, vacuum cleaners (high-drain cell options).
Emergency & Lighting: Emergency exit lights, solar lighting, security systems, backup power supplies.
Toys & Hobbies: RC cars, boats, robots, educational kits (high-rate discharge cells available).

Why OEMs Choose Weijiang Power

16 Years of NiMH Expertise: Focused exclusively on NiMH rechargeable battery technology since 2010.
200,000 Cells Daily Capacity: 12,000 m² factory with in-house cell production, pack assembly and testing lines.
In-House R&D Team: Experienced electrical and mechanical engineers support full custom design — no middlemen.
Flexible MOQ: Small-batch custom orders accepted for prototyping and niche products; scalable to mass production.
Strict Quality Control: 100% incoming cell inspection, in-process quality checks and final batch testing with detailed reports.
Complete Documentation: UN38.3, MSDS, CE, RoHS, REACH — all required documents for safe global air and sea shipping.
Dedicated Account Management: One point of contact from design through mass production and after-sales support.

Start Your Custom Project

Ready to design a custom NiMH battery pack for your product? Request a free sample or send us your specifications (voltage, capacity, dimensions, connector type, target quantity) and our engineering team will respond with a feasibility assessment and quotation within 1 business day.

Cell Performance & Quality Assurance

Every custom NiMH battery pack we build uses cells verified to the following performance standards. All cells are 100% tested for capacity, internal resistance and voltage before assembly.

Cycle Life: 80%+ after 1000 cycles

Self-Discharge: 84% after 6 months @ 20°C

Discharge Voltage: Stable plateau at 0.2C–2C (D-cell representative)

Parameter	Standard	Test Method
Cycle Life	≥1000 cycles (80% DOD)	0.5C charge / 1C discharge, 25°C
Self-Discharge	≤16% / 6 months @ 20°C	Standard charge, store 6 months, measure
Operating Temp	Charge 0–45°C, Discharge −20–55°C	Environmental chamber test
Internal Resistance	≤30 mΩ (AA cell, typical)	AC milliohm meter @ 1kHz
Capacity Tolerance	±5% of rated capacity	0.2C discharge to 1.0V