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48V 20Ah Hailong G70 Downtube Ebike Battery Pack
The GEB 48V 20Ah Hailong G70 Lithium Battery Pack provides a proven, lockable downtube energy solution delivering 960Wh of capacity. Engineered for universal retrofit on hardtail and hybrid bicycle frames, it mounts securely to standard water bottle cage bosses. Equipped with an integrated 30A continuous discharge BMS (60A peak), safety key lock, and a 4-pin quick-release base plate with XT60/Anderson output connectors.
Description
General Electronics Technology Co., Ltd. is one of the leading manufacturers and suppliers of 48V 20Ah Hailong G70 Downtube Ebike 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 48V 20Ah Hailong G70 battery (960Wh) mounts onto standard bicycle water bottle bosses for 250W-1000W motors. Before replacing an existing Hailong pack, verify base plate pin alignment (4-pin vs 5-pin), controller polarity, and frame clearance (365 × 90 × 110 mm).
Verified Engineering Specifications
| Technical Parameter | Factory Benchmark & Tolerance Range |
|---|---|
| Nominal Voltage | 48.0V (Working Range: 39.0V - 54.6V) |
| Rated Capacity | 20.0Ah (960.0Wh @ 0.2C) |
| Cell Specification | Grade-A 18650 / 21700 High-Capacity Li-ion Cells |
| Continuous Discharge | 30A (Optimized for 500W - 1000W motors) |
| Peak Discharge | 60A (≤ 5 seconds) |
| Dimensions | 365 × 90 × 110 mm (±1.5mm) |
| Case Type | Hailong G70 Heavy-Duty Polycarbonate Case with Base |
| Base Plate Connector | 4-Pin / 5-Pin Blade Terminal with XT60 / Anderson leads |
| Cycle Endurance | ≥ 800 cycles (@ 80% DoD, 25°C) |
| Safety Certifications | UN38.3, MSDS, CE, RoHS |
Motor & Drivetrain Compatibility
Compatible Motor Systems: Bafang BBS02B 750W, BBS01B 250W/350W, TSDZ2 mid-drives, Voilamart 48V 1000W hub motors.
Pre-Installation Check: Ensure frame inner triangle height exceeds 130mm to permit smooth forward sliding during battery removal.
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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