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Battery Size Converter Calculator

Work out battery size converter instantly with clear inputs, formula shown and shareable results.

About Battery Size Converter Calculator

Battery naming is a thicket of parallel standards: an AA is also LR6 under IEC for alkaline, R6 for zinc-carbon, and MN1500 as a Duracell part number. Cells in series add voltage while capacity stays the same, so four AA cells give 6 V at roughly 2500 mAh.

Formulas

Series voltage

pack voltage = cell voltage x cells in series

Parallel capacity

cells in parallel add mAh at unchanged voltage

Worked example

With the default values below, Battery Size Converter Calculator returns Pack Voltage In Series of 6.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Battery designationone of AA (LR6/R6), AAA (LR03/R03), C (LR14/R14), D (LR20/R20), 9V (6LR61/PP3), CR2032 coin cell, 18650 lithium-ion
AA (LR6/R6)
Number of cells in seriesminimum 1
4

Results

Pack Voltage In Series
6.00 V
Equivalent Designations
LR6 / R6 / MN1500 / Mignon
Typical Capacity
2,500 mAh
Physical Dimensions
14.5 mm diameter x 50.5 mm

Step by step

  1. 1Values used
  2. 2Series voltage
  3. 3Parallel capacity
  4. 4Pack Voltage In Series= 6.00 V
  5. 5Equivalent Designations= LR6 / R6 / MN1500 / Mignon
  6. 6Typical Capacity= 2,500 mAh
  7. 7Physical Dimensions= 14.5 mm diameter x 50.5 mm

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why do lithium AA cells read 1.7 V?

Because lithium iron disulfide chemistry has a higher open-circuit voltage than alkaline, though it is designed to be a drop-in replacement.

Is an 18650 interchangeable with anything?

No. It is 3.7 V lithium-ion, needs protection circuitry and is physically larger than an AA. Substituting it can destroy equipment.

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