About Us
We help you figure out exactly how long your battery will last — so you're never caught without power.
Why we built this
Built for RV owners, campers, preppers, and anyone who needs reliable backup power during blackouts. Skip the math — just pick your device and battery, and get real answers.
What we offer
- ✓ Simple calculator with device and battery presets
- ✓ Support for powerbanks, power stations, and batteries
- ✓ Accurate calculations considering efficiency losses
- ✓ Free to use, no registration required
Questions or suggestions? Visit our contact page.