Count Hearing-Aid Battery Changes Over a Planning Horizon
A battery bought for a hearing aid is useful only if it is compatible and available when needed. Count replacements from an observed service interval, explicitly excluding the fresh battery already installed on day one.
1 · device group | number of devices | observed days per battery
FIRST-LOAD
Research prototype — checkout unavailable. Input is processed locally and a draft is saved automatically in this browser profile when storage is available. Reset to sample clears that draft; Pro history has its own clear button. A state link encodes your inputs in its URL: share only non-sensitive rows. Browser history, clipboard and anyone receiving the link may retain it. Optional AI use below leaves this device; it is not required.
Data note: Everything runs in this browser tab on the hearing-device supply ladder: your device group | number of devices | observed days per battery stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Perspective: Before: The calculation starts after that fresh battery is already available. After: the hearing-device supply ladder shows the working beside each named row so the reader can change the assumption and inspect the consequence.
2 · Read the hearing-device supply ladder
Consumable planning only, not audiology advice or a reliability guarantee. Ask an audiologist or device supplier about compatibility and unexpected battery life; follow device instructions. Button batteries can cause severe injury if swallowed; keep them away from children and seek urgent help after suspected ingestion.
Paid layer: hearing-device supply ladder print and history
one-time step · the free reading above stays complete
Free tier
- one complete hearing-device supply ladder run in the app
- three samples plus unlimited article-demo runs
- unwatermarked result text and an explicit, user-triggered state link
What $4 one-time adds
- print the hearing-device supply ladder with its row workings
- CSV of replacement batteries and row explanations
- last five reading summaries saved in this browser profile
$4 once for repeated filing of the hearing-device supply ladder, not for a better answer. Illustrative time basis: avoiding one five-minute manual reformat per saved reading; no market-price or guaranteed-savings claim.
Local history (this device)
- No saved runs yet — your first run files here.
Checkout is unavailable until a payment link is configured. The optional unlock is browser-local, profile-scoped and best-effort, not server-verified access. Clearing browser data can remove it; there is no account or cross-device recovery.
Boundary and sources
Consumable planning only, not audiology advice or a reliability guarantee. Ask an audiologist or device supplier about compatibility and unexpected battery life; follow device instructions. Button batteries can cause severe injury if swallowed; keep them away from children and seek urgent help after suspected ingestion.
- Method: Per device, replacements = ceil(horizon days ÷ life days) − 1, floored at zero. Over 30 days with seven-day life, changes occur on days 7, 14, 21 and 28: four per device.
- All sample records are invented examples. The app does not fetch measurements, policies, files or personal records.
- Google’s official pricing page, fetched 2026-09-29, lists free-tier access including AI Studio. Optional formatting only; limits and availability can change. Free-tier content may be used to improve products. Never paste private records there.
Mechanism: competence-autonomy-loop
Optional AI formatting, not calculation
For this hearing-device supply ladder, use the free AI Studio interface only if available to you, with no paid API key. Manual entry completes the same workflow for free. Supply only fictional or non-sensitive notes. Review its output against the source; never paste unresolved questions into the numeric rows.
Format my non-sensitive notes for a hearing-device supply ladder. Return plain rows only: device group | number of devices | observed days per battery. Preserve supplied quantities exactly. Do not guess missing values; list questions separately. Do not calculate or add advice. I will check every row before pasting into the local tool.
Accepted schema: device group | number of devices | observed days per battery. No AI response is executed as code.