Lithium Battery Bank Calculator
Design your DIY lithium battery pack for car audio. Vendor C-rates are derated by operating environment to reflect real-world thermal limits.
Cell Selection
Headway 40152S
LiFePO4Popular car audio cell, excellent cycle life
Operating Environment
Vendor C-ratings are often measured under ideal lab conditions. Select your actual operating environment to derate the maximum current accordingly.
Pack Configuration
Target System Requirements
12–16V typical for car audio
Continuous amps from your system
1.0–1.5 mΩ = clean build with torqued hardware. 3.0–5.0 mΩ = ring terminals, oxidized contacts, or long bus bars.
Action Required: Define Thermal Environment
Lithium cells fail violently under thermal stress. Vendor C-rates are measured under ideal lab conditions — not sealed in a trunk at 140°F. You must select your operating environment before maximum discharge rates can be calculated.
This selection can be changed at any time using the Operating Environment panel on the left.