Battery Charge Time Estimator 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

t4-138

Effect

Computation or source lookup only

Input and validation requirements

A zero charging current produces an undefined division-by-zero result, and the CC-CV note describes a second regime without supplying a CV taper formula or data needed to calculate it. Negative-current handling is also unspecified and can produce a nonsensical negative time if applied literally.

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": 2.4,
    "charge_current_A": 1.5,
    "efficiency_percent": 90
  },
  "expected_outputs": {
    "estimated_charge_time_hours": 1.77777778
  },
  "working": "efficiency_fraction = 90 / 100 = 0.90; base_time = 2.4 Ah / 1.5 A = 1.6 h; estimated_time = 1.6 h × (1 / 0.90) = 1.6 / 0.90 = 1.77777778 h."
}

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