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36V 20.8Ah Double-Deck Rear Rack Battery Pack
Engineered specifically for step-through city bikes, cargo e-bikes, and touring frames lacking down-tube clearance, the GEB 36V 20.8Ah Double-Deck Rear Rack Battery Pack provides 748.8Wh of long-range energy. Constructed with 80 Grade-A 18650 cells in a 10S8P configuration, the pack slides into a heavy-duty aluminum luggage rack that features an internal bottom compartment to house motor controllers cleanly. Includes an integrated red LED safety rear reflector/taillight and dual key locks.
Description
General Electronics Technology Co., Ltd. is one of the leading manufacturers and suppliers of 36v 20.8ah double-deck rear rack battery pack in China. We are committed to providing high quality custom service and OEM&ODM service to global clients. Please feel free to wholesale durable lithium battery packs in stock here and get quotation from our factory.
Engineering Overview & Quick Assessment
This 36V 20.8Ah rear rack battery pack (10S8P, 748.8Wh) is designed for step-through and city touring e-bikes requiring extended range. Check bicycle rear frame dropout spacing, rack wheel size (26" / 28"), and 42.0V charger compatibility before ordering.
Verified Engineering Specifications
| Technical Parameter | Factory Benchmark & Tolerance Range |
|---|---|
| Nominal Voltage | 36.0V (Operating Range: 30.0V - 42.0V) |
| Rated Capacity | 20.8Ah (748.8Wh @ 0.2C discharge) |
| Cell Type & Grade | Grade-A 18650 2600mAh Li-ion (NCM) |
| Configuration | 10S8P (80 Cells) |
| Continuous Discharge Current | 25.0A (For motors up to 500W) |
| Peak Discharge Current | 50.0A (≤ 3 seconds) |
| Integrated Rack Features | Heavy-duty aluminum carrier, internal controller housing, red LED taillight |
| Dimensions (Battery Pack) | 430 × 150 × 65 mm (±1.5mm) |
| Weight (Battery + Rack) | Approx. 5.6 kg total |
| Cycle Life | ≥ 1,000 cycles (@ 80% DoD, 25°C) |
| Certification | UN38.3, MSDS, CE, RoHS |
Motor & Drivetrain Compatibility
Compatible Motor Systems: 250W - 500W 36V front and rear hub motor systems (Bafang, Ananda, MXUS, AKM), European pedelec conversions.
Pre-Installation Check: Supplied with universal adjustable mounting arms suitable for 26-inch, 27.5-inch, and 700C (28-inch) bicycle frames.
Industrial Quality Architecture & Safety
- Automated Cell Sorting & Grading: Every cylindrical cell undergoes automated grading to ensure capacity variance ≤ 1.5% and internal resistance (IR) difference ≤ 2mΩ.
- Precision Pure Nickel Interconnects: Ultrasonic/spot-welded pure nickel strips lower internal resistance, minimize Joule heating during sustained hill-climbing, and prevent thermal runaway.
- Multi-Tier Smart BMS Protection: Real-time hardware monitoring protects against over-charge (4.25V/cell cut), over-discharge (2.8V/cell cut), continuous high-amperage over-current, and short-circuit faults with automatic reset.
- Shock-Resistant Structural Casing: Impact-resistant ABS+PC flame-retardant enclosure (UL94-V0 rated) shields the internal pack from trail debris, road vibration, and accidental drops.
OEM / ODM Customization & Sourcing Workflow
Shenzhen General Electronics Technology Co., Ltd. (GEB) provides complete end-to-end custom battery manufacturing for e-bike brands, distributors, and fleet operators:
Customizable BMS protocols (CAN-Bus, UART, RS485), customized wiring harnesses (Anderson, XT60, XT90-S, waterproof Julet connectors), and tailored discharge profiles.
Fully certified with UN38.3 test reports, MSDS, CE, RoHS, and Sea/Air Dangerous Goods (DG) freight classification for smooth customs clearance worldwide.
Frequently Asked Questions (FAQ)
Q1: How can I verify that this battery will fit my specific e-bike frame?
A: Download the 1:1 scale dimensional drawing or compare the exact enclosure length, width, and height listed in our specification table above with your frame triangle clearance. Ensure a minimum of 15-20mm clearance along the sliding direction for key release.
Q2: What is the sample lead time and mass-production turnaround?
A: Evaluation sample units typically ship within 5 to 7 business days. Mass production batches (100 to 1,000+ units) are fulfilled within 20 to 25 working days depending on cell supply allocation and custom BMS requirements.
Q3: Can GEB customize the battery housing color, branding, and connector pinouts?
A: Yes. We offer laser-etched OEM branding, silk-screened logos, custom color finishes for qualifying order volumes, and custom discharge/charge wiring pinouts tailored to your motor controller.
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