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    Lithium-Ion Battery Engineering & Costing

    Custom Battery Pack Builder & BOM Calculator

    Configure Series ($S$) and Parallel ($P$) cell arrangements with verified 21700 lithium-ion specifications. Model continuous discharge currents, charging power, and full Bill of Materials.

    Series-Parallel Modular Topology Designer

    Custom Lithium-Ion Battery Pack Builder

    Select verified 21700 cells, model S/P topology, current limits, and complete Bill of Materials.

    EVE 58E (5700mAh)
    21700
    20A Drain

    Highest capacity 21700 cell available. Ideal for long-range cruising and commuter ebikes.

    $1.85
    72g / cell
    BAK 53E (5300mAh)
    21700
    15A Drain

    Reliable, high-density cell with low internal resistance and proven cycle stability.

    $1.75
    70g / cell
    EVE 50E (5000mAh)
    21700
    15A Drain

    Industry-standard workhorse 5000mAh cell with excellent cost-per-watt-hour economy.

    $1.65
    69g / cell
    Molicel P45B (4500mAh - Ultra High Power)
    21700
    45A Drain

    Extreme continuous 45A power cell. Best for electric racing, steep hill-climbing, and high-drain motors.

    $3.20
    70g / cell
    BAK 45D (4500mAh - High Drain)
    21700
    30A Drain

    High discharge 30A continuous capability at a balanced price point.

    $2.10
    68g / cell
    Ampace JP40 (4000mAh - Fast Charging)
    21700
    40A Drain

    Next-generation fast-charge capable cell engineered by CATL subsidiary Ampace.

    $2.40
    68g / cell
    EVE 40PL (4000mAh - Power Cell)
    21700
    40A Drain

    High-power cylindrical cell engineered for high-torque commercial cargo and e-moto applications.

    $2.30
    67g / cell
    Series configuration: 13S in seriesNominal: 46.8V · Max: 54.6V
    15 Ah Target → 17.1 Ah Actual (3P)

    Requires 3 cells in parallel per series group. Total pack size: 39 cells (13S3P).

    Pack Configuration
    13S3P

    39 × EVE cells · approx. 4.31 kg

    0.8 kWh
    17.1 Ah
    Discharge & Thermal Limits
    Continuous Current
    17.1 A
    0.8 kW output
    Peak Max Discharge
    60 A
    2.81 kW burst
    Discharge Cut-off
    39 V
    Low-voltage BMS cut
    Full Charge Voltage
    54.6 V
    54.6V for 13S
    Itemized Bill of Materials (BOM)$348.15
    EVE Cells (39 pcs):$72.15
    Smart Bluetooth BMS (Hardware):$45
    Busbars, Wiring, XT90 & Enclosure:$75
    UN3480 Hazmat Sea Freight:$56
    Spot-Welding & Pack Assembly:$100

    Test how far this pack travels?

    Plug your custom voltage & Ah into the physics range simulator.

    Calculate 800-cycle degradation?

    Model lifetime mileage and electricity charging costs.