Aircraft Battery Capacity Tracker

Under Part 91, manufacturer intervals like this are largely advisory — you may operate on condition — but the advisory label hides real teeth: a battery that starts the engine can still fail the capacity check that matters — standby endurance for an alternator-out night IFR scenario. Insurance positions, 135 program requirements, resale value and plain risk management all push toward tracked compliance, and the tracking itself is nearly free. The expensive version is re-deriving component history at pre-buy time.

Anchor each component to its last documented event — overhaul release tag, 8130-3, installation logbook entry — and accrue forward from the aircraft times since that date. Where no anchor exists, the conservative convention is to assume the worst (time-expired or unknown-since-new) and price decisions accordingly. Enter your best-evidenced figure here with the anchor noted in the notes field; a documented assumption beats an optimistic blank.

Only you. Entries live in your browser's local storage and never leave your device, so there is no account, no cloud sync and no one else with access. Because the data is device-local, export a CSV backup before clearing browser data or switching computers.

A plain CSV with one row per entry and labelled column headers — the most portable format there is. Spreadsheets open it directly, most specialised software can map it on import, and a printed copy is perfectly legible to a human reviewer. Nothing proprietary means your component life record is never trapped here.