Start with a clean baseline
Use DeviceOK to collect browser-visible evidence for the power tool battery & charger, then move to the operating system or manufacturer only when the browser reaches a documented boundary.
Live evidence
Relevant checks
Battery Runtime CalculatorEstimate runtime from battery watt-hours, average load and conversion efficiency.
→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.
→Amp Hours to Watt Hours CalculatorConvert nominal battery voltage and amp-hours into nominal watt-hours.
→First sequence
Do the high-signal checks before risky changes
- 1
Use only battery and charger combinations approved for the platform
- 2
Stop using swollen, damaged or overheated packs
- 3
Follow the manufacturer indicator and error guidance
Decision points
What the result should change
If the function works in a neutral deviceok testPrioritize the affected app, permissions, routing or configuration.
If the function fails in deviceok and another trusted pathPrioritize connection, OS recognition, official diagnostics and then hardware.
If the browser cannot access that subsystemUse the OS/OEM diagnostic route instead of interpreting missing browser data as a failure.
Browser can help check
- Estimate runtime from entered ratings
- Compare entered power ratings
- Convert nominal Ah to Wh when voltage is known
Browser cannot prove
- Read tool-pack cell balance or battery-management data
- Certify a battery as safe
- Diagnose a charger electrically
Repair boundary
Know when to stop browser troubleshooting
- Avoid firmware/driver downloads from unofficial aggregators.
- Change one variable at a time and retest under the same condition.
- Physical damage, abnormal heat, liquid exposure and battery swelling require appropriate service handling.
Used-device inspection
What to verify before paying or signing off a repair
- Test the exact functions you depend on
- Inspect all ports/controls and included power accessories
- Record pass/fail evidence before purchase or repair handoff