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Battery Tracker - Functional Specification Document

1. Overview

Battery Tracker is a personal web application designed to help users manage their rechargeable battery inventory. It solves the common problem of losing track of batteries that are placed in rarely-used devices.

2. Problem Statement

Users with multiple rechargeable batteries often:

  • Forget which device contains which batteries
  • Cannot quickly determine how many batteries are available
  • Lose track of batteries currently being charged
  • Have no centralized way to manage battery inventory

3. Core Features

3.1 Battery Type Management

  • Define battery form factors (AA, AAA, 18650, CR2032, etc.)
  • Define battery chemistries (NiMH, Li-ion, LiFePO4, etc.)
  • Associate brands with battery types and chemistries
  • Track total quantity per brand-type-chemistry combination

3.2 Battery Status Tracking

Each brand-type-chemistry combination can have batteries in three states:

Status Description
Available Batteries in storage, ready for use
In Use Batteries currently placed in a device
Charging Batteries currently being recharged

3.3 Device Management

  • Create and manage a list of devices (keyboard, mouse, remote, flashlight, etc.)
  • Assign batteries to devices with quantity
  • Quick view of which device has which batteries

3.4 Quick Actions

  • Move batteries between states (Available -> In Use -> Charging -> Available)
  • Batch operations for multiple batteries
  • Quick "return to storage" action when removing from device

3.5 Dashboard

  • Overview of all battery inventory
  • Quick status summary (X available, Y in use, Z charging)
  • Low stock alerts (optional)

4. User Stories

US-01: Add Battery Type

As a user, I want to add a new battery brand-type-chemistry combination so I can track my inventory.

Acceptance Criteria:

  • Can select from predefined form factors (AA, AAA, 18650, etc.) or add custom
  • Can select from predefined chemistries (NiMH, Li-ion, etc.) or add custom
  • Can enter brand name
  • Can set initial quantity and status
  • If the same brand-type-chemistry combination already exists, the quantity is added to the existing group (upsert behavior)

US-02: View Inventory

As a user, I want to see all my batteries at a glance so I know what's available.

Acceptance Criteria:

  • Shows all brand-type-chemistry combinations
  • Displays count per status (available/in-use/charging)
  • Filterable by type, brand, or chemistry

US-03: Assign to Device

As a user, I want to assign batteries to a device so I can track where they are.

Acceptance Criteria:

  • Select from existing devices or create new
  • Specify quantity being assigned
  • Automatically decrements "available" count

US-04: Return from Device

As a user, I want to mark batteries as returned from a device so they're back in inventory.

Acceptance Criteria:

  • Can return all or partial quantity
  • Choose destination: available or charging
  • Updates device's battery assignment

US-05: Manage Charging

As a user, I want to track which batteries are charging so I know what will be available soon.

Acceptance Criteria:

  • Move batteries to charging status
  • Mark charging complete (moves to available)
  • Optional: track charging start time

US-06: Add Batteries to Existing Group

As a user, I want to add more batteries to an existing group when I purchase more or find additional batteries.

Acceptance Criteria:

  • When adding batteries with same brand-type-chemistry as existing group, quantity is added to that group
  • User receives feedback indicating batteries were added to existing group vs new group created
  • Works seamlessly whether user intentionally or accidentally selects existing combination

5. Data Model (Conceptual)

BatteryType (Form Factor)
├── id
├── name (AA, AAA, 18650, etc.)
└── isCustom

Chemistry (Battery Chemistry)
├── id
├── name (NiMH, Li-ion, LiFePO4, etc.)
└── isCustom

Brand
├── id
└── name

BatteryGroup (Brand + Type + Chemistry combination)
├── id
├── brandId
├── typeId
├── chemistryId
├── availableCount
├── chargingCount
└── notes

Device
├── id
├── name
└── description

DeviceBattery (Junction)
├── deviceId
├── batteryGroupId
├── quantity
└── assignedDate

6. UI/UX Requirements

6.1 Design Principles

  • Clean, minimal interface
  • Mobile-responsive (batteries often managed on-the-go)
  • Quick actions accessible with minimal clicks
  • Visual status indicators (color-coded)

6.2 Key Screens

  1. Dashboard - Overview of all batteries, quick stats
  2. Battery List - Detailed view with filtering
  3. Device List - All devices and their battery assignments
  4. Add/Edit Battery - Form for battery management
  5. Add/Edit Device - Form for device management

6.3 Visual Indicators

  • Green: Available
  • Blue: In Use
  • Orange/Yellow: Charging

7. Non-Functional Requirements

  • Performance: Page load < 2s
  • Data Persistence: All data persisted locally or in database
  • Offline Support: Nice-to-have for future
  • Browser Support: Modern browsers (Chrome, Firefox, Safari, Edge)

8. Out of Scope (v1)

  • Individual battery serial number tracking
  • Battery health/cycle tracking
  • Multi-user support
  • Barcode/QR scanning
  • Push notifications
  • Battery purchase history