Lithium Battery Bank Calculator

Design your DIY lithium battery pack for car audio. Calculate series/parallel configurations for your target voltage and current.

Cell Selection

Cell Type

Headway 40152S

LiFePO4

Popular car audio cell, excellent cycle life

Voltage:3.2V

Capacity:15Ah

Max Cont:10C (150A)

Max Pulse:30C (450A)

Weight:370g

Size:40mm × 152mm

Pack Configuration

Series Cells (S) - Controls VoltageRec: 4S for 14V

12.8V nominal → 14.6V charged

Parallel Cells (P) - Controls Current & CapacityRec: 2P for 300A

60.0Ah total capacity

Target System Requirements

Target Voltage

12-16V typical for car audio

Target Current Draw

Continuous amps from your system

Pack Specifications

4S4P

16 cells total

LiFePO4

Nominal Voltage

12.8V

14.6V charged

Total Capacity

60.0Ah

768Wh energy

Max Continuous

600A

7.7kW power

Max Pulse

1800A

23.0kW burst

Target Met!

50% utilization at 300A

Total Weight5.92kg (13.1lbs)

Empty Voltage (cutoff)10.0V

Target Power Output4.2kW

Cell Layout (16 cells)

1.1

1.2

1.3

1.4

2.1

2.2

2.3

2.4

3.1

3.2

3.3

3.4

4.1

4.2

4.3

4.4

4 series groups × 4 parallel cells each

Build Checklist

BMS is mandatory—get one rated for your series/parallel config and current draw
Fuse at 125% of max continuous: 750A for this configuration
Parallel cells should match in capacity and ideally come from the same batch
Bus bars or nickel strip rated for your amps—10mm² minimum cross-section
Lithium cells store serious energy. Ventilate the enclosure and keep it away from flammable materials.