Original price was: £329.96.£279.90Current price is: £279.90.
Triangle Ebike Battery 48V 20Ah – High-capacity lithium-ion 48V battery designed in a space-saving triangle shape, perfect for frame mounting.
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The frame triangle is the most overlooked real estate in e-bike conversion design — and the electric bike battery that fits inside it is the most elegant solution to the weight distribution and aesthetics challenges that downtube packs can create. The Triangle Ebike Battery 48V 20Ah is a high-capacity, frame-integrated lithium-ion battery pack built on Grade A 18650 2500mAh cells, delivering 960Wh of stored energy in a compact, ergonomic triangle format designed to fit securely inside the main frame triangle of most 48V and 52V compatible bicycles. With a 40A discharge current, 800–1000+ cycle life, and comprehensive BMS protection, this electric bike battery keeps the weight of your conversion centred, low, and hidden — the clean, balanced electric bike triangle battery solution for builders who care as much about how their build looks and handles as how far it goes.
The fundamental advantage of the triangle battery format over any downtube or rear-rack mounted pack is where the weight sits on the bicycle. Mounted inside the main frame triangle — bounded by the down tube, seat tube, and top tube — the electric bike triangle battery places its mass at the geometric centre of the bicycle frame, as low as the frame geometry allows, and directly between the two wheels. This is the optimal position for handling balance and stability: the centre of gravity stays low and centred, the bike tracks and corners naturally, and the added mass of the battery feels like part of the bicycle rather than a cantilevered weight pulling in one direction or another.
Downtube batteries achieve a similar low positioning but typically create a slight forward mass bias. Rear-rack batteries place mass high and rearward — the worst possible position for handling balance, particularly under hard acceleration where rearward weight creates lift on the front wheel. The triangle battery avoids both of these compromises. The result is a converted bicycle that handles closer to an unloaded bicycle than any alternative battery mounting position can deliver — a genuine practical advantage on technical terrain, in tight urban traffic, and at high speeds where precise handling matters.
The Triangle Ebike Battery 48V 20Ah stores approximately 960Wh of usable energy at 48V nominal — matching the capacity of the full-size 48V 20Ah downtube format in a package that disappears inside the frame. For a 48V motor system consuming 15–20Wh per kilometre under mixed conditions, 960Wh delivers an estimated range of 48–64km per charge. For a BAFANG mid drive 750W UART system drawing an average of 20–30Wh per kilometre under mixed load, range extends to 32–48km — more than enough for most daily commuting routes and recreational rides on a single charge.
The visual impact of this battery pack is equally significant. Where a downtube battery is immediately visible as an aftermarket addition, the triangle format fills the frame void that most bicycles already have — the empty space inside the main triangle. A well-installed triangle battery makes a converted bicycle look far closer to a purpose-built electric bike than any external battery mounting can achieve. For builders who want their conversion to look clean and intentional, the electric bike triangle battery format delivers aesthetics that no downtube pack can match.
The electric bike battery is built on Grade A 18650 2500mAh lithium-ion cells — a well-established, high-reliability cell format used across premium consumer electronics, professional battery systems, and high-quality e-bike packs worldwide. Grade A cell selection means every cell in this pack is manufactured to tight internal resistance tolerances — consistent performance across every cell in the series string, even ageing across the full pack, and reliable BMS management through every cycle. The 800–1000+ cycle life specification reflects this quality: 800 cycles at the conservative end, 1000+ under optimal charging and usage patterns, before the pack reaches 80% of its original 960Wh capacity. At one full charge per day, that represents over two years of daily use at the conservative end — a battery pack built for genuine long-term ownership.
The 40A discharge current of this triangle battery sustains up to 1920W of continuous power draw at 48V nominal — well above the motor power range this battery is designed to support, providing meaningful headroom against BMS protection thresholds under hard riding conditions. The XT60 connector is a robust, high-current rated interface well-suited to the 40A continuous and peak current demands of this electric bike battery. The XT60 format is also the most widely used connector in the DIY e-bike conversion market — compatible with the majority of motor controllers across the 48V conversion kit range without adapter modification.
The Triangle Ebike Battery 48V 20Ah charges to a full charge cut-off voltage of 54.6V in approximately 7 hours from empty at the standard charge rate. The BMS terminates charging automatically at 54.6V regardless of charger output, eliminating overcharge risk with any compatible charger. A 7-hour charge time suits overnight routines naturally — charge from empty to full while stationary, ride fully charged the next day. The standard charge current delivers gentle thermal conditions during each charging session that contribute directly to achieving the 800–1000+ cycle longevity specification.
The integrated BMS in this electric bike triangle battery provides four-layer active protection across every charge and discharge cycle. Overcharge protection terminates charging at 54.6V. Over-discharge protection enforces the low-voltage cut-off to preserve cell chemistry. Overcurrent protection limits discharge current under fault conditions. Short-circuit protection provides immediate system shutdown on wiring or connector failure. Active 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 800–1000+ cycles. The BMS operates continuously and transparently, requiring no user maintenance or intervention of any kind.
The Triangle Ebike Battery 48V 20Ah is designed for compatibility with most standard bicycle frame triangles across mountain bike, hybrid, trekking, and commuter platforms. The compact, ergonomic triangle case profile uses integrated mounting straps and brackets to secure the battery firmly inside the frame triangle without drilling, welding, or permanent frame modification. The durable, heat-resistant outer casing protects the internal cell assembly from vibration, mechanical impact, and weather exposure during normal riding use. Verify your frame triangle dimensions against the battery’s physical profile before ordering — frame triangle sizes vary significantly between bicycle categories and sizes, and smaller frames may not accommodate the full battery volume without clearance conflicts at the pedal/crank interface.
Compatible with most 48V and 52V eBike systems, this battery pack pairs directly with the full range of 48V hub motor and mid drive conversion kits available from All4eBikes. For the full range of 48V and 52V compatible conversion kits, visit the Conversion Kit category page. For the complete battery range across downtube, triangle, and all capacity options, visit the Batteries category page. For a direct capacity comparison with the top-specification downtube format, the Ebike Battery 48V 25Ah delivers 1200Wh in a downtube format for builds where the frame triangle cannot accommodate a triangle battery.
| Spec | Detail |
|---|---|
| Voltage | 48V |
| Capacity | 20Ah |
| Battery Type | Lithium-ion (Li-ion) |
| Energy | ~960Wh |
| Cell Type | Grade A 18650 2500mAh |
| Discharge Current | 40A |
| Charging Voltage | 54.6V |
| Cycle Life | 800–1000+ cycles |
| BMS Protection | Overcharge, over-discharge, overcurrent, short-circuit |
| Charging Time | ~7 hours |
| Connector | XT60 |
| Case Material | Durable, heat-resistant |
| Compatibility | Most 48V and 52V eBikes and DIY conversion setups |
| Format | Triangle (frame-integrated) |
The Triangle Ebike Battery 48V 20Ah is the complete, frame-integrated electric bike battery for builders who want 960Wh of capacity, centred weight distribution, and a clean build aesthetic that no downtube format can match. Grade A 18650 cells, 40A discharge, 800–1000+ cycle life, XT60 connectivity, and four-layer BMS protection — the electric bike triangle battery that makes your conversion look and handle the way it should. The premium triangle battery battery pack for serious 48V builds.
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