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UPS / Battery Backup diagnostics

Test what the browser can see. Know when it cannot.

Estimate runtime from entered energy and load, then use the UPS maker's software for battery health, self-tests and protected electrical measurements.

Run these first

Relevant live checks

Battery Runtime CalculatorEstimate runtime from battery watt-hours, average load and conversion efficiency.
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USB Voltage Current to Watts CalculatorCalculate watts from an entered USB or charger voltage/current profile.
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Browser Battery StatusShow charging state and charge level when the browser exposes the Battery Status API.
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First diagnostic sequence

Do the high-signal checks before risky changes

  1. 1

    Enter realistic average load rather than peak nameplate watts

  2. 2

    Run the manufacturer's UPS self-test if available

  3. 3

    Replace batteries only using the exact supported battery specification

What DeviceOK/browser can help check
  • Calculate runtime from user-entered Wh/load/efficiency
  • Check browser battery status on the computer when supported
What this browser page cannot prove
  • Read UPS battery health generically
  • Measure mains voltage or transfer time
  • Perform a protected UPS self-test