Description
Upgrade your e-bike with a compact, high-performance battery built for serious riders. This 14S2P lithium-ion pack uses authentic EVE 40PL 21700 cells, paired with a Jiabaida (JBD) 50A Smart BMS for intelligent protection, performance tracking, and real-world reliability. Lightweight, rugged, and sealed for the elements—ready to power your adventure.
📐 Physical Dimensions
| Dimension | Size |
|---|---|
| Length | 233 mm |
| Width | 94 mm |
| Height | 110 mm |
✅ Key Features
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🔋 51.1V nominal / 58.8V max
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⚡ 8Ah capacity (~409Wh total energy)
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🔌 50A smart BMS with Bluetooth monitoring
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🔧 Discharge: XT90S connector (anti-spark)
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🔌 *Charge port: XT60 connector
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🧠 Real-time app access to battery data
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🧱 ABS hard case + heat-shrink wrapped for water resistance
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🚵♂️ Lightweight (under 6 lbs) – perfect for mountain or trail e-bikes
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🔥 Power rating: Ideal for 2,500W to 3,000W motor systems
🛠️ Professional Build Quality
This pack has been professionally built using only premium-grade components and expert techniques:
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⚡ Laser-cut copper + 0.2mm pure nickel sandwich for ultra-low resistance
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🔒 Precision spot welding with clean, high-strength joints
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🧰 High-temp wiring, proper strain relief, and clean insulation
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🧼 Built with attention to detail for long-lasting safety and performance
🔌 Connectors
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Main Discharge Connector: XT90S anti-spark
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Charging Connector: XT60
These industry-standard connectors ensure a secure, high-current connection and are compatible with most e-bike controllers and lithium chargers.
📦 Battery Pack Specifications
| Parameter | Value |
|---|---|
| Configuration | 14S2P (28 total cells) |
| Nominal Voltage | 51.1V |
| Max Charge Voltage | 58.8V |
| Cutoff Voltage | 35.0V |
| Capacity | 8Ah |
| Total Energy | ~409Wh |
| Max Continuous Discharge | 50A (BMS-limited) |
| Cell Discharge Capability | 140A (70A × 2P, limited for longevity) |
| Recommended Charging Current | Up to 8A |
| Max Charging Current | 20A (BMS-rated) |
| Weight | Under 6 lbs (approx. 2.7 kg) |
🔋 Cell Details – EVE INR21700-40PL
| Specification | Value |
|---|---|
| Nominal Capacity | 4000mAh (4Ah) |
| Nominal Voltage | 3.65V |
| Max Continuous Discharge | 70A per cell |
| Max Pulse Discharge (10s) | 80A |
| Charge Voltage | 4.2V |
| Cutoff Voltage | 2.5V |
| Dimensions | 21.15mm x 70.15mm |
| Chemistry | INR (Li-ion high drain) |
| Origin | China |
🧠 JBD 50A Smart BMS Features
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🔌 Continuous Discharge: 50A
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🔋 Charge Current: Up to 20A
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📲 Bluetooth Monitoring App (iOS & Android)
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📊 Live Data: Cell voltages, pack voltage, temperature, SOC, current, cycle count
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🚨 Protections: Over-voltage, under-voltage, overcurrent, short-circuit, and temperature
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🔁 Balance Function: Yes
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⚙️ Common port design
💧 Water-Resistant & Rugged Design
The battery is enclosed in a durable ABS hard case, then wrapped with dual-wall rubberized heat shrink tubing (rated 125°C, 1000V) for:
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🌧️ Water resistance
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🛡️ Dust & impact protection
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🔥 Flame retardant and heat insulation
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🧽 Professional finish and corrosion resistance
This setup keeps your battery safe from rain, dust, and trail abuse.
⚙️ Designed for Real-World Performance
Although the cells are rated for 140A, this pack is limited to 50A via the BMS to:
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🧊 Reduce heat and stress on the cells
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⚡ Maintain voltage stability under load
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🔁 Extend cycle life and overall pack performance
Result: Power when you need it, reliability over time.
🧭 Ideal Applications
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E-Bikes (2,500W–3,000W)
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E-Scooters
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DIY Go-Karts / EV builds
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Robotics & Automation
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Solar Storage / Off-grid Power
⚠️ Important Notes
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Always charge using a 58.8V lithium-ion charger
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Do not exceed the BMS current rating unless upgraded
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Mount securely with proper airflow and vibration protection
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Avoid exposure to saltwater or submersion
💬 Need a custom version?
Contact us — we can build to your exact voltage, capacity, or shape requirements.