# 2026-07-11 Daily Demand Decision

## Winner

**TJ Flight Battery Ready / TJ 飞行充电宝行前检查器**

一个本地运行的中英双语行前工具：把 mAh 与电压换算为 Wh，按 ICAO/IATA、FAA、American Airlines、Lufthansa、Singapore Airlines、中国大陆境内航班或日本 2026 规则给出 `READY / VERIFY / NO-GO` 结论，生成携带清单并导出 JSON 携带卡。

## Why this need won

- ICAO 2026 年 3 月 27 日紧急更新把充电宝限制为每人最多两个，并禁止机上给充电宝充电。
- IATA 的旅客调查显示，45% 的受访者误以为充电宝可以托运，33% 不清楚较大电池或备用电池的限制。
- 规则的“最后一公里”明显分化：日本自 2026-04-24 起新增数量和机上充电限制；新航与汉莎禁止机上使用/充电和头顶行李架存放；中国境内航班额外要求清晰 CCC/3C 标识且不得是召回批次；美国航空对便携充电器采用每人两个、每个不超过 100 Wh 的更保守规则。
- 2026-07-01 至 2026-07-08 的 Reddit、T3、TechRadar 等近期页面继续出现“多航司联程到底按哪条”“规则一直在变”“多少 mAh 才能上飞机”的直接问题。
- 电商页面仍用“airline approved / travel-friendly”营销，但也要求买家自行核对航司，说明购买信号强、信息责任却分散。

## Research coverage

- 31 个有效页面。
- 14 个独立来源家族。
- 7 个国家或语言区域：全球规则、美国、欧盟/德国、中国大陆、日本、新加坡、澳大利亚，并补充越南与菲律宾社区信号。
- 15 个官方或一手页面。
- 23 个页面明确标注发布于 2026 年，另有 4 个无可见发布日期的当前 live policy；12 个为近 30 天页面或当前 live policy。
- 关键判断均用至少两个独立来源家族交叉验证。
- Google、Bing、百度直接搜索结果页被工具安全策略阻止；X 只能看到索引文本、直接页面为空；YouTube、Instagram、微信公开文章未返回有效公开结果；淘宝无可用公开列表；闲鱼只加载公开壳且无商品结果。这些未计入 31 个有效页面。

结构化账本见 `sources.json`。

## Candidate scoring

每项 10 分，越高越好；总分 80。

| Candidate | Pain | Frequency | Pay intent | Evidence | Same-day | Data/legal safety | Differentiation | Time-to-MVP | Total | Decision |
|---|---:|---:|---:|---:|---:|---:|---:|---:|---:|---|
| Flight power-bank rule checker | 9.3 | 8.8 | 7.7 | 9.6 | 9.7 | 9.4 | 8.9 | 9.8 | **73.2** | Winner |
| Live power-bank recall/lot scanner | 9.0 | 7.6 | 8.1 | 8.8 | 5.2 | 8.4 | 8.5 | 5.0 | 60.6 | Rejected: reliable live recall coverage and model normalization cannot be guaranteed today |
| Cross-airline rule-change alerts | 8.7 | 8.5 | 8.2 | 9.0 | 4.6 | 7.6 | 8.6 | 4.0 | 59.2 | Rejected: core depends on recurring scraping, monitoring and outbound notification |
| General offline travel wallet | 7.3 | 8.4 | 7.8 | 7.2 | 8.8 | 9.4 | 5.8 | 8.6 | 63.3 | Rejected: useful but less acute and more crowded; does not solve the 2026 rule change directly |
| Marketplace “flight-approved” buyer verifier | 8.0 | 7.9 | 8.8 | 7.4 | 5.4 | 7.2 | 8.1 | 5.3 | 58.1 | Rejected: verification would need product certificates, recalls and seller-specific data not reliably public |

## Delivered core

- Deterministic mAh × V ÷ 1,000 → Wh calculation and direct Wh mode.
- Seven rule profiles with official source links and a visible 2026-07-11 verification date.
- Conservative decision engine covering capacity, quantity, readable markings, damage/recall state, airline approval band and China CCC/3C requirement.
- Journey-specific checklist for carry-on, gate-check removal, terminal protection, overhead storage and in-flight use/charging.
- Browser-local recent history and JSON packing-card export.
- English-first / Chinese switch, favicon, keyboard focus, responsive mobile layout and reduced-motion fallback.
- Original CSS 3D cutaway power-bank object with pointer inspection response; no copied asset and no external generation.
- TJ NOVA LTD standard footer, main-site link and legal links.

## Design record

- Xiaomo ingestion pack: used.
- Yanzhou Designer route: **TJ Flight Battery Ready = air-travel compliance + calm pre-flight confidence + airport inspection bench + ceramic/translucent battery optics + inspection/scan feedback + exportable packing card**.
- Landing first screen: product identity, 2026 verification date, live 37 Wh example, carry-on / accessible proof and `Check my battery` CTA.
- Motion grammar: reveal + inspection + scan. Motion explains inspection state and depth; reduced-motion keeps the static cutaway poster.
- Living visual: CSS 3D translucent power-bank shell with visible cells, pointer tilt and highlight shift.
- Pre-build score: 94/100, above the 85 gate.

## Boundaries

This is decision support, not airline approval or legal advice. Policies can change and the operating airline, airport or security officer may apply stricter rules. No login, booking, purchase, message, private scraping, production publish, DNS, VPN/network change or credential action was performed.

## Validation

See `validation.json`. Browser screenshots and interaction evidence are recorded only after actual checks; no PASS is claimed before execution.