Original price was: £320.00.£290.00Current price is: £290.00.
Battery 52V 20Ah Hailong – A high-capacity lithium-ion battery in a sleek Hailong case, ideal for 52V electric bikes with motors up to 1000W.
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The Battery 52V 20Ah Hailong is a high-capacity, premium lithium-ion downtube battery pack built for 52V and 48V electric bike systems running motors from 250W up to 1500W. Housed in the durable, compact Hailong case — one of the most widely used and frame-compatible battery enclosures in the e-bike conversion market — this 52V 20Ah ebike battery delivers 1040Wh of stored energy from Grade A 21700 LG 4800mAh cells. The Battery 52V 20Ah Hailong is the right choice for builders who want serious range, premium cell quality, and the performance advantage that 52V voltage brings to any 48V or 52V motor system. This is not a compromise battery — it is a fully specified, properly engineered 52V battery pack for serious builds.
The most important performance characteristic of the Battery 52V 20Ah Hailong is its voltage. Running a 48V-rated motor on a 52V battery pack is one of the most effective and underutilised performance upgrades in the e-bike conversion world. Higher voltage at the same current draw means more power delivered to the motor — peak power increases, acceleration sharpens off the line, and top-end speed improves noticeably compared to running the same motor on a standard 48V pack. Equally important, higher voltage at equivalent power output means lower current draw — the motor and controller run cooler, wiring stress decreases, and component life extends under sustained hard use. The Battery 52V 20Ah Hailong delivers all of these advantages in a downtube format that fits the same mounting brackets as a standard 48V pack.
With a rated capacity of 20Ah at 52V nominal, the 52V 20Ah ebike battery stores 1040Wh of usable energy — enough for an estimated 52–69km of range from a 250W–350W mid drive system under mixed conditions, and meaningful real-world range even from higher-output 750W–1500W motor systems under hard use. For daily commuters covering longer distances, weekend tourers, and cargo build operators who need maximum range between charges, the 1040Wh capacity of this Battery 52V 20Ah Hailong puts it in the long-range category of the 52V downtube battery lineup. The step up from the 48V 13Ah format is significant — the 48V 13Ah battery stores 624Wh at a lower voltage, while this pack delivers 67% more energy at a higher operating voltage that sharpens motor performance across the entire power range.
The Battery 52V 20Ah Hailong is built on Grade A 21700 LG 4800mAh lithium-ion cells — a premium cell specification that underpins both the capacity and the long-term reliability of this pack. The 21700 format delivers higher energy density per cell than the standard 18650, enabling 1040Wh within the compact Hailong downtube footprint. LG cell chemistry is among the most respected in the lithium-ion industry for consistency, cycle performance, and thermal stability. Grade A selection ensures every cell in the pack meets the tightest internal resistance tolerances — consistent performance across every cell, even ageing across the full pack, and reliable BMS management through every charge cycle.
The cycle life specification confirms this quality — ≥80% capacity retention after 800 full charge cycles. At one full charge per day, that represents over two years of daily riding before the pack reaches 80% of its original 1040Wh capacity. Under typical partial-charge usage patterns, practical service life extends significantly beyond that benchmark.
The 52V lithium-ion battery operates between a full charge voltage of 58.8V and a discharge cut-off of 42V. At full charge, the pack delivers peak voltage for maximum motor performance and sharpest throttle response. As the pack discharges through its operating range, voltage declines gradually until the BMS enforces the 42V cut-off to protect the cells from deep discharge damage. The 16.8V operating window between full charge and cut-off delivers the full 1040Wh of energy across a voltage range that any 48V or 52V motor controller handles natively without configuration adjustment.
The discharge specification of this 52V battery is built specifically for demanding motor applications. At 40A continuous discharge, the pack sustains up to 2080W of continuous power draw at 52V nominal — well above even the 1500W maximum motor rating this battery supports, providing substantial headroom against BMS protection thresholds under normal riding conditions. The 100A peak discharge current handles the high-amplitude current spikes during hard acceleration from a standstill without voltage sag or protective shutdown. This is the discharge performance of a 52V 20Ah ebike battery engineered specifically for high-power motor applications, not a general-purpose lithium pack repurposed for e-bike use.
The Hailong case is the most widely used battery enclosure format in the e-bike conversion and OEM market — recognisable by its sleek, tapered profile and standard mounting interface that fits the vast majority of bicycle down tube positions without modification. The Battery 52V 20Ah Hailong uses this format to deliver the broadest possible frame compatibility across mountain bikes, hybrid frames, commuter platforms, and custom build bases. The Hailong mounting system uses a secure slide-and-lock mechanism that keeps the battery firmly in position across rough terrain while allowing tool-free removal for charging. At 368 × 123mm and 5.8kg, it sits cleanly within the standard Hailong bracket footprint on most frames — verify clearance against your specific frame geometry before ordering.
The integrated BMS in the Battery 52V 20Ah Hailong provides active protection against every common lithium battery failure mode. Overcharge protection terminates charging at 58.8V to prevent cell damage from excess voltage. Over-discharge protection enforces the 42V cut-off to preserve cell chemistry at the bottom of the discharge curve. Overcurrent protection limits discharge current under fault conditions, safeguarding both the cells and the connected motor controller. Short-circuit protection provides immediate shutdown in the event of a wiring fault or connector failure. Cell balancing during charging ensures every cell in the series string reaches the same state of charge — the key mechanism that maintains capacity consistency across 800+ cycles and prevents early-ageing divergence between individual cells.
The Battery 52V 20Ah Hailong is compatible with the full range of 48V and 52V hub motor and mid drive systems from 250W through to 1500W. For hub motor builds in the high-performance tier, the E-Bike Conversion Kit 1500W BLACK is a directly compatible system that benefits directly from the 52V voltage advantage — the same motor running on 52V instead of 48V delivers measurably sharper acceleration and higher peak power. For the full range of 48V and 52V compatible conversion kits across all motor formats and power levels, visit the Conversion Kit category page. For the complete battery range across all voltages and capacities, visit the Batteries category page.
The 52V lithium-ion battery charges at a standard rate of 3A, delivering a full charge from empty in approximately 6–7 hours — suited to overnight charging routines that prioritise gentle charge current for maximum long-term cell health. For faster turnaround, the pack supports a maximum continuous charge current of 5A, reducing full charge time to approximately 4 hours. The BMS terminates charging automatically at the 58.8V cut-off regardless of charger output, eliminating overcharge risk at either supported charge rate.
| Spec | Detail |
|---|---|
| Compatible Motor Power | 48V / 52V, 250W–1500W |
| Nominal Voltage | 52V |
| Rated Capacity | 20Ah |
| Energy | 1040Wh |
| Cell Type | Grade A 21700 LG 4800mAh |
| Cycle Life | ≥80% after 800 cycles |
| Weight | ~5.8kg |
| Dimensions | 368 × 123mm |
| Standard Charge Current | 3A |
| Max Charge Current | 5A |
| Max Continuous Discharge | 40A / 40A |
| Peak Discharge | 100A / 100A |
| Charge Cut-off Voltage | 58.8V |
| Discharge Cut-off Voltage | 42V |
| Format | Downtube (Hailong case) |
| BMS Protection | Overcharge, over-discharge, overcurrent, short-circuit |
The Battery 52V 20Ah Hailong is the complete, high-performance 52V 20Ah ebike battery for builders who want premium cell quality, serious range, and the full performance advantage of 52V operation. Grade A 21700 LG cells, 1040Wh of usable energy, 40A continuous discharge, comprehensive BMS protection, and the industry-standard Hailong case format — the Battery 52V 20Ah Hailong is the 52V battery pack that serious 48V and 52V builds deserve.
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