Hey Product Hunt, I built VBatPower because estimating battery life for a small electronics project usually means a spreadsheet, a datasheet, and a lot of unit-conversion mistakes. I wanted one place where the numbers stay honest. What it does: Battery-life model — describe your device as batteries → components → states with duty cycles, and get a discharge estimate. 438 formulas across 32 categories — Ohm's law to RF link budgets — solve for any variable, with built-in unit selectors. Every formula is checked against an independent reference implementation, so the numbers you get are the numbers you can trust. Calculator flows — chain inputs, library formulas, and your own expressions over one shared namespace; everything recomputes live and is dimension-checked, so you can't accidentally add volts to amps. Real measurements — log current/voltage from an Arduino, ESP32, or STM32 as a simple CSV and chart the actual discharge curve against your prediction. It's browser-native, free while in beta, and you don't need an account to start. A free account just syncs your projects across devices and unlocks the REST API. I'd love feedback on the formula coverage and the flow builder especially — what's missing for your workflow? Happy to answer anything here.

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1d ago

VBatPower.com -- Questions and Feedback

Hi everyone

I'm the maker of VBatPower (vbatpower.com) a free, browser-based tool for battery and power engineering. It's built to answer three questions for anyone working on battery-powered electronics: how long will it last, how much power does your circuit draw, and how does it discharge over time.

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VBatPower

Battery-life & power simulation for electronics

Battery-life & power simulation for electronics

Forum Threads

VBatPower.com -- Questions and Feedback

Forum Threads

VBatPower.com -- Questions and Feedback