Ebike Battery 48V 25Ah — 1200Wh Samsung Cell Battery

Samsung 21700 Cells — The Premium Cell Specification

The defining specification of this battery 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.

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.

1200Wh — Maximum Range in the 48V Format

At 25Ah and 48V nominal, this battery 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 battery 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 — this battery 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.

40A Continuous, 100A Peak — High-Power Discharge Specification

The discharge specification of this battery 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.

Voltage Window — 54.6V Full Charge to 37.4V Cut-Off

This battery 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 limits automatically — overcharge protection and over-discharge protection operating transparently without user intervention.

Dimensions — 368 × 156mm

This battery 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.

The 368mm length is consistent with the standard downtube format and fits all standard bracket mounting positions.

BMS — Comprehensive Four-Layer Cell Protection

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 battery requires no user maintenance of any kind.

Charging — 3A Standard, 5A Fast

This 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.

Warranty and Returns

Every Ebike Battery 48V 25Ah purchased from All4eBikes is covered by a 12-month warranty against manufacturing defects, alongside a 30-day return window for complete purchase confidence.