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Laptop, phone, UPS, power-bank and portable power-station users

Charging & Backup Power Planner

Plan charger wattage, battery energy, backup runtime and required battery size from documented device ratings without pretending the browser can read charging protocols or battery health.

Inspection principle

Power planning is arithmetic plus protocol/connector reality. Watt-hours estimate energy; watts describe power. Neither proves that a charger, cable and device will negotiate the required mode.

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Run the browser-visible checks, then record the physical/native checks below. Progress stays in this browser unless you deliberately copy the fragment share link.

Live evidence

Browser-visible checks

1
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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2
Voltage × currentCalculate watts from an entered USB or charger voltage/current profile.
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3
Battery runtimeEstimate runtime from battery watt-hours, average load and conversion efficiency.
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4
Required battery energyEstimate the battery energy needed to run an average load for a target number of hours.
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5
Charge-time estimateEstimate battery charging time from energy capacity, charger power and entered charging efficiency.
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6
Power-bank charge estimateEstimate how many full-equivalent device charges a power bank can provide from entered Wh values and conversion efficiency.
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Outside the browser

Physical & native checks

These close the blind spots a website cannot inspect.

1
Read device/charger/cable ratings

Record voltage/current/wattage markings and exact model numbers from official labels/specs.

Why it matters: Marketing totals can differ from per-port output.
2
Cable capability

Use an appropriately rated cable for the required power/data mode; inspect for damage.

Why it matters: The cable can be the limiting link even when charger wattage is sufficient.
3
Peak/surge requirements

For UPS/power stations, compare continuous and surge output with the actual load.

Why it matters: Energy capacity alone does not guarantee the inverter can start a load.
Stop / escalate

Conditions that deserve caution

  • Damaged, swollen, wet or unusually hot battery/power equipment.
  • Required voltage/polarity/connector is uncertain—do not experiment with incompatible power.
Decision rule

How to use the evidence

Use the calculator to size the problem, then verify exact voltage/protocol/connector requirements from the device and power-source documentation.

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