Manufacturer discharge-curve reference

Reviewed 2026-11-09. One strong, primary-source dataset is supplied rather than substituting generic OCV curves or mirrored documents with uncertain provenance.

Energizer AA/LR6 alkaline, 100 mA at 21 °C

Source: Energizer, Alkaline Manganese Dioxide Handbook and Application Manual, 2018, page 11, Figure 12. The page is printed “Page 11 of 14”; it is also the 11th PDF page. Figure 12’s subtitle specifies 100 mA constant-current discharge at 21 °C. The figure caption identifies the 0.8 V cutoff. It describes a generic AA/LR6 alkaline cell family, not an E91 SKU or a Duracell/Panasonic product. The manufacturer states that the handbook does not constitute a performance warranty.

The actual graph was visually inspected from a 1600-pixel selected-page render of the public manufacturer PDF. The orange loaded-voltage trace, not the nearby capacity-versus-current bar chart, was read at coarse knots. No original graph image or full copyrighted PDF is copied into the website. Facts and approximate numeric graph readings are stored with attribution in assets/data/battery-discharge-references.json.

The source x-axis is elapsed hours. Because the annotated test is constant current, conversion is discharged_Ah = 0.100 × elapsed_hours:

Use approximately ±0.03 V and ±0.05 Ah as visual-reading bounds, including endpoint uncertainty. These are deliberately coarse reading allowances, not statistical uncertainty, lot variation or guaranteed cell performance. The starting point at t≈0 cannot resolve the immediate load-application transient. Piecewise-linear interpolation between knots introduces additional unquantified shape error; it does not recover the manufacturer’s underlying raw measurements.

Source discrepancy preserved

The visible orange trace reaches 0.8 V at approximately 24 hours, while the explanatory paragraph below uses a rounded 25 hours / 2500 mAh example. Its 1.2 V example likewise rounds to 15 hours / 1500 mAh. The provided knots follow the plotted trace and do not stretch the x-axis to force the prose’s rounded example. Do not advertise 2.4 Ah as an exact guaranteed capacity.

Permitted interpretation in the calculator

• These are loaded terminal voltages at 100 mA and 21 °C, not open-circuit voltage or relaxed state of charge. The point at zero delivered Ah remains a graph-start value, not an independently established OCV.
• Direct interpolation is bounded to 0–approximately 2.4 Ah and the plotted 0.8 V cutoff. A higher device cutoff will reduce usable capacity. Lower-cutoff predictions would extrapolate beyond this reference and must be rejected.
• With an explicitly user-supplied effective resistance R, a demonstration may form Voc_estimate(Ah) ≈ Vtest(Ah) + 0.100 A × R. Applying the same R and subtracting 0.100 A × R reproduces the coarse reference curve by construction. This is an internal consistency check, not independent model validation or an OCV measurement.
• Subtracting another load’s I × R provides only an approximate scenario. Resistance, polarization, effective capacity, recovery and temperature depend on current and discharge history. The source itself discusses those effects on pages 7–10. Arbitrary-load results are not qualified by this dataset.
• No current rating, charge behavior, manufacturer interoperability or pack safety rating follows from a single discharge trace.

Verification and artifact accounting

JSON syntax, finite numeric values, strictly increasing Ah knots, nonincreasing voltage, zero-Ah start, and final 0.8 V cutoff were checked. All 14 knots satisfy the structural constraints. The official source PDF was 423,648 bytes; only it and a selected-page PNG were temporarily materialized for visual inspection. They are outside the repository and are not website payloads. No dependencies, large downloads or full-document image batch were created.

The older Energizer NH15-2300 manufacturer PDF link returned 404 during this review. No NiMH or lithium reference curve was invented to fill that gap. Add another chemistry only after its current primary manufacturer graph and exact test conditions can be inspected.