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Electrical

Battery Charge Time Calculator

Estimate constant-current charging time for a capacity increment.

Ideal component relationshipsUnits and assumptions explained below
Circuit workbench
Circuit workbench

Keep RMS, peak and DC values distinct.

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Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter capacity to add, charging current.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

Input reference and sample values

Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.

InputFormat and unitsSample
Capacity to addNumeric value. Unit: Ah. Zero or positive.10
Charging currentNumeric value. Unit: A. Must be greater than zero.2

Result for these sample inputs

5 hours

Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.

The method, explained

Ideal charging time = amp-hours to add/current.

A WORKED EXAMPLE

Using capacity to add = 10 Ah, charging current = 2 A, the result is 5 hours. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

Excludes tapering and losses; not a charger setting recommendation. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Methodology maintained by ClarityKit. How these tools are built and checked.