Battery Tools

Overview

Estimate battery runtime from capacity, or required capacity from desired runtime, using the measured average current.

Data Source

The average current can come from:

• Auto mode (default) — uses the average from the current selection or chart view
  • When a selection is active, shows a selection badge and uses selection stats
  • Otherwise uses the chart window average
  • The resolved value is shown as a read-only “Using: X.XX uA (source)” line
• Manual mode — type a value in the Current (mA) field to override

Runtime Estimator

Given a battery capacity and average current, estimates how long the battery will last.

Inputs:

• Current (mA) — auto from chart/selection, or manual
• Capacity (mAh) — battery rated capacity

Outputs:

• Runtime — estimated hours/minutes
• Effective capacity — after derating
• Effective current — after derating

Capacity Estimator

Given a desired runtime and average current, estimates the required battery capacity.

Inputs:

• Current (mA) — auto or manual
• Runtime (h) — desired runtime in hours

Outputs:

• Required rated capacity — including derating overhead
• Required net capacity — raw energy needed

Derating Factors

Expand Derating factors to adjust:

Factor	Default	Description
Efficiency	100%	DC-DC converter or regulator efficiency
Depth of Discharge	100%	Usable fraction of battery capacity
Aging Margin	100%	Capacity loss over battery lifetime

All factors multiply together: effective = rated x efficiency x DoD x aging.