Battery Capacity / C-Rate / Runtime Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-114

Effect

Computation or source lookup only

Input and validation requirements

A zero load current creates a division-by-zero runtime result, and the specification does not define whether to reject it or report unlimited idealized runtime. Negative-current sign handling is also unspecified, producing either a misleading negative runtime or a charging-state interpretation. No derated-capacity formula or true piecewise branch is supplied.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "capacity_Ah": 100,
    "load_current_A": 5,
    "c_rate": 0.5
  },
  "expected_outputs": {
    "runtime_hours": 20,
    "max_discharge_current_A": 50
  },
  "working": "Runtime: t = Capacity / current = 100 Ah / 5 A = 20 h. Maximum current: I_max = C-rate × Capacity = 0.5 × 100 Ah = 50 A."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json