Our battery pack designer helps engineers and DIY builders create custom lithium battery packs for any application. Configure your cells, set series and parallel connections, and visualize the layout in 2D or 3D — all in your browser.

What you can do with this tool:

• Configure your pack — Set cell format, voltage, capacity, and series/parallel configuration to match your target specs.
• Visualize the layout — See your pack in 2D with dimensions, or switch to 3D for a realistic preview of how cells will fit in your enclosure.
• Check fitment — Set a target workspace size and see if your configuration fits. The tool warns you when cells exceed the available space.
• Share your design — Every configuration generates a unique URL. Share it with collaborators or save it for later.
• Export to STL — Generate 3D-printable cell holders, enclosures, and frames with our STL generator.

The designer works with common cell formats (18650, 21700, and custom dimensions) and supports both rectangular and offset layouts.

If you're still deciding on your pack configuration, start with the pack planner to figure out the right cell count and series/parallel layout. Once you have a configuration, come back here to design the physical pack.

Need a BMS for your build? The BMS picker matches your pack specs to products you can buy.

For a complete walkthrough of the build process, check out our battery pack build guide.