Original price was: £215.90.£189.90Current price is: £189.90.
Discover the benefits of the Battery 36V 15Ah for electric bikes, featuring durability and optimal performance for your rides
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Reliable energy storage is the foundation of every well-built e-bike conversion, and the Battery 36V 15Ah delivers exactly that — a high-quality, Grade A cell downtube lithium battery pack engineered for 36V motor systems running between 250W and 350W. Built on 18650 Grade A cells with a rated capacity of 13Ah and 468Wh of stored energy, this ebike battery 36v 15ah gives you the range, discharge capability, and long-term cycle life that a properly specified conversion demands. Whether you’re powering a Bafang BBS01 250W mid drive or a 36V hub motor conversion, this Battery 36V 15Ah is the matched energy source that keeps the system running efficiently from the first charge to the eight hundredth.
The most important specification in any lithium battery pack is not the headline voltage or capacity figure — it’s the quality of the cells inside. The Battery 36V 15Ah is built on 18650 Grade A lithium-ion cells — the same cell format used in premium consumer electronics, medical devices, and performance EV applications. Grade A cells are manufactured to the tightest tolerances, with consistent internal resistance values across every cell in the pack. That consistency matters enormously for pack performance and longevity: balanced cells charge evenly, discharge evenly, and age at the same rate — the BMS can manage the pack optimally rather than compensating for weak cells dragging down the overall capacity.
The cycle life specification reinforces this — ≥80% capacity retention after 800 charge cycles. At one full charge cycle per day, that represents over two years of daily riding before the pack reaches 80% of its original capacity. Most riders will get significantly longer useful life from this pack under typical usage patterns. This is not a cheap cell pack assembled to hit a price point — it is a quality build designed to deliver consistent performance over the long term.
The downtube form factor positions the Battery 36V 15Ah along the down tube of the bicycle frame — the largest structural tube on most bicycle designs — using a standard mounting bracket and locking mechanism. This placement keeps the battery weight low in the frame and centred between the wheels, contributing to balanced handling and a low centre of gravity that makes the converted bicycle feel stable and natural rather than top-heavy. The downtube format is also the most widely compatible battery mounting standard across bicycle frames, fitting the vast majority of road, mountain, hybrid, and commuter frame platforms without modification.
This is a downtube 36v battery built in a compact profile — 368 x 92mm overall dimensions and a net weight of approximately 4.4kg — making it one of the lighter 36V battery options in the range while still delivering 468Wh of usable energy. For the complete range of downtube and triangle battery options across all voltages and capacities, visit the Batteries category page.
The Battery 36V 15Ah carries the following confirmed specifications:
The battery 36v nominal voltage represents the average operating voltage across the full discharge curve. At full charge, this pack sits at 42.0V — the charge cut-off voltage at which the BMS stops accepting current to protect cell health. At the low end of the discharge curve, the BMS cuts off at 30.0V to prevent cell damage from over-discharge. The usable operating range between these two points is where the 468Wh of energy is delivered.
The rated capacity of 13Ah at 36V nominal gives you 468Wh of stored energy — a solid mid-range capacity for a ebike downtube battery at this voltage level. In real-world use, range depends heavily on motor efficiency, terrain, rider weight, and assist level — but as a general reference, a 250W–350W motor system consuming an average of 15–20Wh per kilometre delivers an estimated range of 23–31km per charge from this pack under mixed conditions. Running the motor at lower assist levels or on flat terrain extends that range considerably.
The discharge specification of this ebike battery 36v 15ah is where its suitability for motor applications becomes clear. At 40A continuous discharge current, this pack can sustain full motor output across the 36V 250W–350W range indefinitely without thermal stress or BMS protection tripping. The 100A peak discharge current handles the high-current demand spikes that occur during hard acceleration from a standstill — a brief, high-amplitude current draw that a well-specified BMS and quality cells handle cleanly without voltage sag or protective shutdown. This is the discharge profile of a properly specified e-bike battery, not a general-purpose lithium pack adapted to motor use.
Every downtube 36v battery in this range incorporates an integrated Battery Management System that continuously monitors and manages cell health across every charge and discharge cycle. The BMS handles overcharge protection — preventing any cell from exceeding the 42.0V charge cut-off. It manages over-discharge protection — cutting output at 30.0V to preserve cell chemistry. It monitors cell temperature and limits current under thermal stress. It balances cell voltage across the pack during charging to ensure every cell in the series string charges to the same level — the key factor in long-term cycle life consistency.
This active management is what separates a quality hailong 36v 15ah format battery from unprotected cell assemblies — it is what makes the 800-cycle life specification achievable in real-world use rather than just laboratory conditions.
The Battery 36V 15Ah is specified for 36V motor systems rated between 250W and 350W. The primary applications are the BAFANG 250W mid drive — the BBS01B platform that uses this exact voltage and draws well within the pack’s continuous discharge capability — and 36V hub motor conversion kits such as the Rear Hub Motor 36V-48V 500W. Both systems operate comfortably within the 40A continuous discharge ceiling of this pack, giving you clean, consistent power delivery without BMS intervention under normal riding conditions. For the full range of 36V, 48V, and 52V conversion kits across all formats and power levels, visit the Conversion Kit category page.
The Battery 36V 15Ah charges at a standard rate of 3A — a charge current that delivers a full charge from empty in approximately 4–5 hours and is gentle on the cells, contributing to long cycle life. For faster turnaround, the pack supports a maximum continuous charge current of 5A, reducing full charge time to approximately 2.5–3 hours. Both charge rates are handled by the integrated BMS with no risk of overcharge — the BMS terminates charging automatically at the 42.0V cut-off voltage regardless of charger output.
| Spec | Detail |
|---|---|
| Compatible Motor Power | 36V 250W–350W |
| Nominal Voltage | 36V |
| Rated Capacity | 13Ah |
| Energy | 468Wh |
| Cell Type | 18650 Grade A lithium-ion |
| Cycle Life | ≥80% capacity after 800 cycles |
| Weight | ~4.4kg |
| Dimensions | 368 × 92mm |
| Standard Charge Current | 3A |
| Max Charge Current | 5A |
| Max Continuous Discharge | 40A / 40A |
| Peak Discharge Current | 100A / 100A |
| Charge Cut-off Voltage | 42.0V |
| Discharge Cut-off Voltage | 30.0V |
| Format | Downtube |
The Battery 36V 15Ah is the complete, properly specified ebike downtube battery for 36V motor systems — Grade A cells, integrated BMS, 468Wh of usable energy, 40A continuous discharge, and 800-cycle longevity in a compact downtube format. This is the hailong 36v 15ah battery that keeps your 36V conversion running cleanly, consistently, and for the long term — exactly what a well-built e-bike demands from its energy source.
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