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Power Tool Battery & Charger diagnostics

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

Use manual energy and runtime calculations plus manufacturer charge indicators while avoiding unsafe claims about cell health or charger electronics.

Run these first

Relevant live checks

Battery Runtime CalculatorEstimate runtime from battery watt-hours, average load and conversion efficiency.
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Charger Wattage MatchCompare a device's entered power requirement with a charger's rated wattage while keeping USB-PD/PPS and voltage-profile limits explicit.
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Amp Hours to Watt Hours CalculatorConvert nominal battery voltage and amp-hours into nominal watt-hours.
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First diagnostic sequence

Do the high-signal checks before risky changes

  1. 1

    Use only battery and charger combinations approved for the platform

  2. 2

    Stop using swollen, damaged or overheated packs

  3. 3

    Follow the manufacturer indicator and error guidance

What DeviceOK/browser can help check
  • Estimate runtime from entered ratings
  • Compare entered power ratings
  • Convert nominal Ah to Wh when voltage is known
What this browser page cannot prove
  • Read tool-pack cell balance or battery-management data
  • Certify a battery as safe
  • Diagnose a charger electrically