Original price was: £406.90.£324.90Current price is: £324.90.
Ebike Battery 48V 25Ah– A high-capacity lithium-ion battery designed for 48V electric bikes, ideal for motors up to 1000W
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The Ebike Battery 48V 25Ah is a high-capacity, premium lithium-ion downtube battery pack built on 21700 Samsung cells — delivering 1200Wh of stored energy for 48V and 52V motor systems rated from 250W up to 1500W. With a 40A continuous discharge current, 100A peak output, and a cycle life of ≥80% capacity after 1000 full cycles, this is the 48V 25Ah lithium-ion battery for builders who want maximum range, Samsung cell quality, and the discharge capability to sustain high-power motor systems without compromise. The Ebike Battery 48V 25Ah is the largest capacity pack in the 48V downtube range — the definitive long-range energy source for serious conversions and high-demand riding applications.
The defining specification of the Ebike Battery 48V 25Ah that sets it apart from every other pack in the 48V downtube range is the cell chemistry — 21700 Samsung cells. Samsung SDI is one of the two most respected lithium-ion cell manufacturers globally, alongside LG, and the 21700 Samsung cell format delivers the highest energy density per cell available in the cylindrical lithium-ion market. Higher energy density per cell means more total capacity within a manageable physical footprint — and it means the cells operate with lower internal stress per unit of energy stored, contributing directly to the 1000-cycle life specification that makes this 48V lithium battery a genuinely long-term investment rather than a consumable item to be replaced regularly.
Samsung cell quality means Grade A internal resistance consistency across every cell in the pack — balanced charge distribution, uniform ageing, and reliable BMS management through every cycle. The cycle life specification reflects this quality directly: ≥80% capacity retention after 1000 full charge cycles. At one full charge per day, that is close to three years of daily use before the pack reaches 80% of its original 1200Wh capacity. Under typical partial-charge patterns, practical service life extends further still.
At 25Ah and 48V nominal, the Ebike Battery 48V 25Ah stores 1200Wh of usable energy — the highest capacity available in the 48V downtube battery range. For a 48V motor system consuming 15–20Wh per kilometre under mixed conditions, 1200Wh delivers an estimated range of 60–80km per charge from a mid drive system in the 250W–350W range. High-output motor systems in the 750W–1500W range draw more energy per kilometre but still deliver full-day range figures that make this 48V battery for electric bike the natural choice for extended commuting, multi-stage touring, delivery applications, and any build where running out of battery is simply not an option.
For context within the 48V range, the Ebike Battery 48V 22.5Ah delivers 1080Wh — the Ebike Battery 48V 25Ah adds 120Wh of additional capacity and the premium Samsung cell specification at 25Ah. For builders who want equivalent capacity at 52V for the additional voltage performance advantage, the 52V range offers comparable energy storage at elevated voltage — see the full range on the Batteries category page.
The discharge specification of the Ebike Battery 48V 25Ah is matched for high-output motor applications up to 1500W. At 40A continuous discharge at 48V nominal, the pack sustains up to 1920W of continuous power draw — substantially above the 1500W maximum motor rating, providing meaningful headroom against BMS protection thresholds under sustained hard riding including steep climbs, heavy cargo loads, and sustained high-speed flat running. The 100A peak discharge current handles the high-amplitude current spikes during hard acceleration from a standstill without voltage sag or protective shutdown — the peak discharge rating that distinguishes a properly specified high-power 48V 25Ah lithium-ion battery from lower-rated packs that struggle under hard motor demand.
For high-power hub motor builds that benefit from the full 40A continuous and 100A peak discharge capability of this pack, the E-Bike Conversion Kit 2000W BLACK is a directly compatible motor system that draws within this battery’s discharge specification. For the complete range of compatible conversion kits across all motor formats and power levels, visit the Conversion Kit category page.
The 48V battery for electric bike operates between a full charge voltage of 54.6V and a discharge cut-off of 37.4V. At full charge the pack delivers maximum voltage for peak motor performance and sharpest throttle response. As the pack discharges through its 17.2V operating window, voltage declines gradually while delivering the full 1200Wh of stored energy across a range that any standard 48V or 52V motor controller handles natively. The BMS enforces both the 54.6V upper limit and the 37.4V lower limit automatically — overcharge protection and over-discharge protection operating transparently without user intervention.
The Ebike Battery 48V 25Ah measures 368 × 156mm and weighs approximately 6.2kg. The 156mm width accommodates the higher cell count required for 1200Wh in 21700 Samsung cell format and must be verified against your frame’s down tube clearance before ordering. Mountain bike, hybrid, and full-size commuter frames with standard down tube profiles typically accommodate the 156mm width without issue. Smaller road bike frames, compact city bikes, and smaller frame sizes may have tighter clearance that conflicts with this width — measure your frame’s available mounting width against the 156mm dimension before purchasing. The 368mm length is consistent with the standard downtube format and fits all standard bracket mounting positions.
The integrated BMS in the Ebike Battery 48V 25Ah provides four layers of active protection across every charge and discharge cycle. Overcharge protection terminates charging at 54.6V. Over-discharge protection enforces the 37.4V cut-off to preserve cell chemistry. Short-circuit protection provides immediate system shutdown on wiring or connector failure. Overcurrent protection limits discharge current under fault conditions, protecting both the Samsung cells and the motor controller from damage. Active cell balancing during charging ensures every Samsung cell in the series string reaches the same state of charge — the critical mechanism that maintains capacity consistency across 1000 cycles and prevents the early-ageing cell divergence that degrades lower-quality packs. This 48V lithium battery requires no user maintenance of any kind.
The 48V battery charges at a standard rate of 3A, delivering a full charge from empty in approximately 8 hours — suited to overnight charging routines that keep the pack at full capacity every morning. For faster turnaround, the pack supports a maximum continuous charge current of 5A, reducing full charge time to approximately 5 hours. The BMS terminates charging automatically at the 54.6V cut-off regardless of charger output, eliminating overcharge risk at either supported charge rate. Standard 3A overnight charging is the optimal routine for long-term cycle life — gentle charge current minimises thermal stress on the Samsung cells during each charging session and contributes directly to achieving the 1000-cycle longevity specification.
| Spec | Detail |
|---|---|
| Compatible Motor Power | 48V / 52V, 250W–1500W |
| Nominal Voltage | 48V |
| Rated Capacity | 25Ah |
| Energy | 1200Wh |
| Cell Type | 21700 Samsung lithium-ion |
| Cycle Life | ≥80% after 1000 cycles |
| Weight | ~6.2kg |
| Dimensions | 368 × 156mm |
| Standard Charge Current | 3A |
| Max Charge Current | 5A |
| Max Continuous Discharge | 40A / 40A |
| Peak Discharge | 100A / 100A |
| Charge Cut-off Voltage | 54.6V |
| Discharge Cut-off Voltage | 37.4V |
| Format | Downtube |
The Ebike Battery 48V 25Ah is the maximum-capacity, premium-cell 48V battery for electric bike conversions — 1200Wh of stored energy, 21700 Samsung cells, 1000-cycle longevity, 40A continuous discharge, 100A peak output, and comprehensive BMS protection in a standard downtube format. This 48V 25Ah lithium-ion battery is the definitive long-range energy source for serious 48V builds — the 48V lithium battery and 48V battery specification that demands nothing less than premium performance from every charge.
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