52V 12ah Premium eBike Battery – Featuring the Advanced Ampace JP40 21700 Cells - Made in the USA | High-Current | Cold-Weather Ready The Next Generation of High-Performance eBike Batteries Experience next-level power and reliability with the 52V Ampace JP40 eBike Battery, custom-built by Bicycle Motor Works in Bethlehem, Pennsylvania. As a family-owned manufacturer since 2014, we handcraft each pack using only premium, Grade-A cells — ensuring superior performance, safety, and durability. Powered by the Ampace JP40 21700 cell, the most advanced lithium-ion technology on the market, this pack delivers exceptional discharge rates, cold-weather endurance, and ultra-efficient thermal control for the most demanding eBike setups. Ampace JP40 – The Cell That Redefines High-Current Performance The Ampace JP40 is the new benchmark for high-current 21700 lithium-ion cells, outperforming industry favorites like Molicel P42A, P45B, and P50B in every measurable way. They are superior in high-current applications in several ways: - Highest-performing 21700 cell by discharge rate - Exceptional cold-weather performance – No loss of capacity down to -20°C (-4°F) - Tabless “all-tab” design – Delivers up to 140A peak current (5-second bursts per cell) - Outperforms Molicel P42A, P45B, and P50B in energy delivery and heat control - Proven durability – Survived 100-cycle stress tests (30A continuous / 5A charge) with only 2% capacity loss These cells are purpose-built for extreme eBike power, offering reliable high output, efficient cooling, and consistent performance — even under heavy throttle or steep climbs. Choose Your Power Level Model | Capacity | Energy (Wh) | Cell Type | BMS Rating | Dimensions (inches) | Approx. Weight 8Ah Pack | 416Wh | Ampace JP40 21700 | 60A continuous / 100A max | 6 × 4 × 3 | 4.8 lbs 12Ah Pack | 624Wh | Ampace JP40 21700 | 80A continuous / 120A max | 12 × 3.3 × 3 | 6.2 lbs 16Ah Pack | 832Wh | Ampace JP40 21700 | 80A continuous / 120A max | 12 × 4.25 × 3 | 7.0 lbs Each pack includes: - 10AWG silicone output wiring - XT-90S anti-spark discharge connector - XT-60 heavy-duty charge connector - Temperature-protected BMS - Double shrink-wrapped rubber armor for impact protection Performance Highlights - 52V = More Power on Any 48V System – Plug-and-play upgrade for more torque & range - Handles 80A+ Continuous Output – Ideal for CYC X1, BBSHD Ludicrous, and BAC ASI setups - High Efficiency & Low Resistance – Custom copper/nickel busbars for smooth current flow - Superior Heat Dissipation – Tight internal structure prevents trapped heat - Compact, Rugged Design – Tough rubber exterior for vibration and water resistance - Long Cycle Life – Up to 1000 charge cycles with consistent performance This pack is engineered to deliver more torque, throttle response, and sustained power, even under heavy load — with minimal heat buildup for long-lasting reliability. Built with Care. Tested for Excellence. Every Bicycle Motor Works battery is hand-assembled, spot-welded, and tested for voltage, balance, and resistance. Each unit includes: - Precision cell-matching and balancing - Solid nickel and copper connections for efficient current delivery - 80A continuous BMS with integrated temperature protection - Smart balancing circuit for extended cell life and performance consistency Our compact frame design improves heat transfer and safety by minimizing internal air gaps — ensuring every ride stays cool and reliable. Safety Guidelines Lithium-ion batteries are powerful devices and must be handled responsibly. Please follow these precautions: - Use only the correct lithium-ion charger - Never short, puncture, or modify the pack - Do not charge unattended or near flammable materials - Avoid use if wet, swollen, or physically damaged - Charge in a fireproof or metal container - Read our eBike Battery 101 Guide for detailed safety and care tips Improper use can result in injury or damage — if in doubt, consult a professional. Shipping Information - Built to order and shipped in sequence - Typical lead time: 5–10 business days - Tracking provided upon shipment - Ships from Bethlehem, Pennsylvania - U.S.-based support available for all customers Why Riders Choose Bicycle Motor Works - Proudly Built in the USA since 2014 - Family-Owned, Quality-Focused Craftsmanship - Premium Certified 21700 Cells Only – Never Rewrapped - High-Performance Engineering for Real Riders - Trusted Nationwide by Builders & Enthusiasts Bicycle Motor Works – Premium American-Made eBike Batteries. Engineered for Power. Built to Last.