# Codebook: FDA reports about batteries, chargers and charging on power wheelchairs and scooters

Written before any report in the set was coded. Mobility Atlas study, October 2026.

## Pool
FDA MAUDE device reports with narrative text that mention a battery, a charger or charging, fire, smoke, melting or sparks (word search on the report text), from three sets:
(a) product code ITI ("Wheelchair, Powered") received 1 January 2019 to 31 December 2023, found by openFDA text search for battery, batteries, charger, charging or fire (88 reports);
(b) product code ITI received from 1 January 2024 to the latest update read on 10 October 2026 (the 1,296-report Mobility Atlas set) whose text matches BATTER, CHARG, FIRE, SMOKE, MELT or SPARK (48 reports);
(c) product code INI (mobility scooters) received from 1 January 2016 to the same date, with the same text match (87 reports).
Pool: 223 reports. Many mention a battery only in passing; the codebook sorts those out.

## What you record for each report
One line per report: `report_key,device,category,injury,charging,lithium,note`

### DEVICE (one letter), ONLY as the report states it
- C: power wheelchair; S: mobility scooter; A: a power add-on on a manual chair (SmartDrive, e-motion, Firefly and similar); U: cannot tell.

### CATEGORY (one letter): what the report says the battery or charging problem was. Precedence: the FIRST letter that applies wins.
1. F: FIRE, flames, smoke, melting, explosion or burst, on the device, its battery, its charger, its wiring or the outlet.
2. H: OVERHEATING without fire: a battery, charger, cable or connector got hot, or a person was burned by a hot part.
3. L: BATTERY DAMAGE: leaking acid, swelling, cracked case, corroded terminals, or a person harmed by battery acid or by handling a battery.
4. C: CHARGER or CHARGING fault without heat or fire: the charger failed, would not charge, wrong charger used, charging port or cord broken.
5. W: WIRING or CONNECTOR fault in the battery or charging circuit without heat or fire: loose, cut, pinched or disconnected battery harness, fuse, terminal.
6. D: POWER LOSS blamed on the battery: dead or drained battery, short range, battery died while driving, the device stopped and the report names the battery.
7. O: the battery or charging is mentioned but the problem the report describes is something else (for example "the battery was charged" in a report about a tip-over).
8. U: a battery or charging problem is alleged but you cannot tell which kind.
- N: no event or problem involving the device is described.

### FLAGS (y or n)
- injury: the report states harm to the body or medical care (burn, smoke inhalation, injury, hospital, death). Damage to property alone is n.
- charging: the event happened while the device or battery was charging or plugged in.
- lithium: the report states the battery was lithium (lithium-ion, LiFePO4, Li-ion).

### note
At most 15 words: the part named (battery, charger, harness, outlet), the place (home, outside), and anything that made the choice hard. No quotes longer than 6 words. No personal details.

## Output format
CSV with header `report_key,device,category,injury,charging,lithium,note`, one row per report in your chunk, nothing else. Every report gets exactly one row.