CellBuilder Pro
$9/month
The free builder still sizes your pack. Pro tells you whether it survives its own rated current.
- Thermal, busbar and performance analysis on every build
- Designs saved to your account and synced across devices
- Cancel any time — you keep access for the month you paid for
Sign in to upgrade
Billed monthly through Base44 Payments. Card details are entered on the secure checkout page, never here.