72v 8-12ah Samsung 40T 21700, Lithium ion E-Bike Battery
72v 8-12ah Samsung 40T 21700, Lithium ion E-Bike Battery
⚡ Samsung 40T High-Current eBike Battery – Proven Performance Since 2018
72 V Power Pack | Choice of 8 Ah or 12 Ah | 80 A Continuous BMS | USA Made
🔋 Overview
Trusted by riders since 2018, our Samsung 40T High-Current eBike Battery has earned its reputation for reliability, durability, and consistent performance.
Hand-built in Bethlehem, PA by Bicycle Motor Works, this pack uses premium Samsung 21700 40T cells and a heavy-duty BMS to deliver smooth, stable power for high-performance e-bikes and mid-drives.
Available in 8 Ah (720 Wh) or 12 Ah (864 Wh) configurations, both packs feature a rugged enclosure, pure copper/nickel connections, and industry-leading thermal control for dependable operation under load.
⚙️ Technical Specifications
| Feature | 8 Ah Model | 12 Ah Model |
|---|---|---|
| Voltage / Configuration | 72 V (20S 2P) | 72 V (20S 3P) |
| Cell Type | Samsung 21700 40T 4000 mAh 30 A | Samsung 21700 40T 4000 mAh 30 A |
| Capacity | 8 Ah | 12 Ah |
| Energy (Wh) | 720 Wh | 864 Wh |
| Continuous Rating / BMS | 80 A cont., 120 A burst BMS | 90 A cont., 120 A burst BMS |
| Cell Discharge Rating | 60 A continuous (2P) | 90 A continuous (3P) |
| Wiring | 10 AWG silicone output leads | 10 AWG silicone output leads |
| Connectors | XT-90S output / XT-60 charge port | XT-90S output / XT-60 charge port |
| Dimensions (approx.) | 9 " × 4 " × 3 " | 13.75 " × 3.75 " × 3.25 " |
| Weight | ≈ 7 lb | ≈ 11.25 lb |
🚀 Key Features
✅ Proven Samsung 40T Cells – The original high-current e-bike standard; trusted by Bicycle Motor Works since 2018.
✅ U.S. Made Quality – Hand-assembled and tested in Bethlehem, PA.
✅ Rugged Construction – Thick rubber outer layer and double shrink wrap for protection.
✅ Thermal Stability – Tight internal build reduces heat buildup for longer cycle life.
✅ High Power Output – Up to 120 A burst current for peak performance and acceleration.
✅ Plug-and-Play Compatibility – Perfect for CYC Motors, BBSHD Ludicrous, and BAC/ASI controllers.
🧠 Engineering Excellence
Every pack is spot-welded using solid nickel and copper busbars for low resistance and minimal voltage sag.
The tight-frame construction improves heat dissipation and cell longevity – unlike packs with loose internal air space that trap heat like double-pane glass.
A temperature-protected BMS maintains cell balance and prevents over-charge, over-discharge, and thermal runaway.
This pack delivers consistent power output and long-term stability under intense conditions.
⚠️ Safety Information
Lithium-ion batteries are powerful and must be used responsibly.
Always:
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Charge only with an approved lithium-ion charger.
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Monitor while charging and store in a safe, dry area.
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Handle with care to avoid damage.
Never:
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Modify connectors or wiring.
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Use if damaged or wet.
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Leave charging batteries unattended.
Contact Bicycle Motor Works or a qualified technician if unsure about battery compatibility or charging procedure.
🚚 Shipping Information
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All e-bike batteries are built to order.
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Typical turnaround: 5–10 business days.
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Tracking provided upon shipment.
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Ships safely within the continental U.S.
🏆 Why Choose Bicycle Motor Works
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🇺🇸 Proudly Made in the USA since 2014
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🔋 Authentic Samsung 21700 Cells – never rewrapped or recycled
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⚙️ Family-Owned, Quality-Driven Craftsmanship
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💪 High-Current Designs for Serious Riders
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🔧 Trusted Nationwide by Builders & Professionals
Bicycle Motor Works – Premium American Power for Performance Riders.
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I got tired of waiting for my overseas batteries. I found Bicycle Motor Works here in the U.S. . Matt and Jackie shipped my batteries within a couple weeks. Now I am having fun riding my E bike.
Thank you battery buddies Mike T.
Thank you, Michael. We also have been enjoying conversing with you. Happy riding!