Update README with app icon and feature overview

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# Battery Tracker <div align="center">
<img src="static/icon-512.png" alt="Battery Tracker" width="160">
<h1>Battery Tracker</h1>
<p><strong>Stop losing track of your batteries.</strong></p>
<p>A fast, self-hosted web app that tells you exactly where every rechargeable battery is,<br>
how healthy it is, and when it was last charged — all from any device on your network.</p>
</div>
A self-hosted web app for tracking rechargeable batteries — where they are, what condition they're in, and which devices they're installed in. ---
Built with Flask + SQLAlchemy. Runs on a Raspberry Pi or any Linux box with a systemd user service. ## Why Battery Tracker?
Rechargeable batteries are everywhere — remotes, flashlights, sensors, toys, tools. Without a system, you end up guessing which batteries are dead, buying new ones you didn't need, and finding half-charged stragglers rattling around a drawer.
Battery Tracker gives you a single source of truth:
- **Know where every battery is.** Each battery is assigned to a device or a storage location. No more mystery batteries.
- **Track health over time.** Log capacity tests and see a trend chart. Spot batteries that are degrading before they let you down.
- **Never forget to charge.** Log charge events, track charge cycles, and see at a glance which batteries are running low.
- **Works with Home Assistant.** If you already have smart battery sensors, Battery Tracker will pull the live percentage automatically — no manual updates needed.
- **Runs on a Pi.** Lightweight enough for a Raspberry Pi Zero. No cloud, no subscription, no data leaving your home.
---
## Features ## Features
@@ -11,33 +29,39 @@ Built with Flask + SQLAlchemy. Runs on a Raspberry Pi or any Linux box with a sy
- Track status: **Available**, **Installed**, **Retired** - Track status: **Available**, **Installed**, **Retired**
- Store metadata: size (AA/AAA/18650/…), chemistry (NiMH/Li-ion/…), capacity, tested capacity, charge cycles, purchase date, storage location, notes - Store metadata: size (AA/AAA/18650/…), chemistry (NiMH/Li-ion/…), capacity, tested capacity, charge cycles, purchase date, storage location, notes
- Visual health indicator when tested capacity is recorded (good / warn / bad) - Visual health indicator when tested capacity is recorded (good / warn / bad)
- Battery percentage field — set manually or synced from Home Assistant; resets to 100% when a charge is logged - Battery percentage — set manually or synced live from Home Assistant; resets to 100% when a charge is logged
- Retire and unretire batteries - Retire and unretire batteries
### Devices ### Devices
- Add devices with a name, battery slot count, type (Remote Control, Flashlight, Sensor, …), and notes - Add devices with a name, battery slot count, type (Remote Control, Flashlight, Sensor, …), and notes
- Install batteries into devices — by brand/quantity or by picking a specific battery - Install batteries into devices — by brand/quantity or by picking specific batteries
- Bulk install multiple batteries at once from the dashboard - Bulk install multiple batteries at once from the dashboard
- Mixed-brand warning when batteries from different brands share a device - Mixed-brand warning when batteries from different brands share a device
- Link a device to a Home Assistant battery sensor to automatically track charge level - Link a device to a Home Assistant battery sensor for automatic live percentage tracking
- Edit device details in-place
### Dashboard ### Dashboard
- Overview stats (total / available / installed / retired) + **Low Battery** count when any battery is below 20% - Overview stats (total / available / installed / retired) + **Low Battery** count when any battery is below 20%
- Charge summary: total charge events and events in the last year
- Full battery table with client-side filtering by status, brand, size, storage location, and free-text search - Full battery table with client-side filtering by status, brand, size, storage location, and free-text search
- Column picker (Chemistry, Capacity, Storage, Purchase Date, Cycles, Battery %) stored in localStorage - Column picker (Chemistry, Capacity, Storage, Purchase Date, Cycles, Battery %) stored in localStorage
- Quick-assign available batteries to a device without leaving the page - Quick-assign available batteries to a device without leaving the page
- Bulk actions: Unassign, Retire, Delete, Set Field (storage location or brand), Install in Device - Bulk actions: Unassign, Retire, Delete, Set Field (storage location or brand), Install in Device
### History & Charts
- **Capacity history** — track tested capacity over time with a trend chart; full log in a modal with year filter and pagination
- **Charge history** — log every charge event; full log in a modal with year filter and pagination
- **Percentage history** — see a live chart of battery percentage over time; full log in a modal
### Home Assistant Integration (optional) ### Home Assistant Integration (optional)
- Link any device to a Home Assistant entity (e.g. `sensor.tv_remote_battery`) - Link any device to a Home Assistant entity (e.g. `sensor.tv_remote_battery`)
- A background poller fetches the current percentage on a configurable interval (default 5 min) and updates all installed batteries in that device - Background poller fetches the current percentage on a configurable interval (default 5 min) and updates all installed batteries in that device
- Low-battery warning badge (< 20%) on the dashboard, device detail, and battery detail pages - Low-battery warning badge (< 20%) on the dashboard, device detail, and battery detail pages
- Fully optional — when `HOMEASSISTANT_URL` is not set the app works exactly as before - Fully optional — when `HOMEASSISTANT_URL` is not set the app works exactly as before
### UI ### UI
- Mobile-friendly: card-style table rows on small screens, full-width filter controls, stacked form buttons - **PWA** — installable on Android, iOS, and desktop; works as a home screen app
- Dark mode — follows the OS system preference automatically (`prefers-color-scheme`) - **Mobile-friendly** — card-style table rows on small screens, full-width filter controls, stacked form buttons
- **Dark mode** — follows OS system preference automatically (`prefers-color-scheme`)
- No JavaScript framework — vanilla JS only - No JavaScript framework — vanilla JS only
--- ---
@@ -51,7 +75,7 @@ Built with Flask + SQLAlchemy. Runs on a Raspberry Pi or any Linux box with a sy
| Database | SQLite (dev) / MariaDB (prod) | | Database | SQLite (dev) / MariaDB (prod) |
| WSGI server | Waitress | | WSGI server | Waitress |
| Process manager | systemd user service | | Process manager | systemd user service |
| Tests | pytest (71 acceptance tests) | | Tests | pytest (80 acceptance tests) |
--- ---
@@ -145,18 +169,24 @@ MIGRATION.md Schema migration instructions + MariaDB procedure
requirements.txt requirements.txt
sbin/ sbin/
install-service.sh systemd user service installer (prompts for HA config) install-service.sh systemd user service installer (prompts for HA config)
static/
icon-192.png PWA icon (192×192)
icon-512.png PWA icon (512×512)
favicon.ico Browser favicon
manifest.json PWA manifest
sw.js Service worker
templates/ templates/
base.html Layout, CSS variables, dark mode, nav base.html Layout, CSS variables, dark mode, nav
dashboard.html Battery list with filters, bulk actions, HA% column dashboard.html Battery list with filters, bulk actions, HA% column
battery_add.html Add batteries form battery_add.html Add batteries form
battery_detail.html Battery detail + edit (includes battery_percentage field) battery_detail.html Battery detail + history charts + modals
battery_delete.html Delete confirmation battery_delete.html Delete confirmation
assign.html Assign battery to device assign.html Assign battery to device
device_list.html Device list with type filter device_list.html Device list with type filter
device_add.html Add device form device_add.html Add device form
device_detail.html Device detail + install + edit (includes ha_entity_id field) device_detail.html Device detail + install + edit
tests/ tests/
conftest.py pytest fixtures conftest.py pytest fixtures
test_acceptance.py 50 acceptance tests test_acceptance.py acceptance tests
test_ha_integration.py 21 HA integration tests test_ha_integration.py HA integration tests
``` ```