Lithium batteries store a large amount of energy in a compact space. If they short circuit, overheat, or are damaged, they can enter thermal runaway. This causes rapid overheating, fire, and even explosion. Aircraft fires are extremely difficult to control. That's why lithium batteries are strictly regulated as dangerous goods in aviation.锂电池在紧凑的空间内储存大量能量。如果它们短路、过热或损坏，可能进入热失控状态。这会导致快速过热、起火甚至爆炸。飞机上的火灾极难控制。这就是为什么锂电池在航空领域被作为危险品严格管制。

Power banks contain lithium batteries, which risk thermal runaway. If a power bank short circuits or overheats, it can cause a fire. Aircraft fires are extremely dangerous. Lithium battery fires are also difficult to extinguish. That's why power banks are strictly regulated on flights.充电宝含有锂电池，存在热失控风险。如果充电宝短路或过热，可能引发火灾。飞机上的火灾极其危险。锂电池火灾也很难扑灭。这就是为什么充电宝在航班上受到严格管制。

A damaged or swollen battery indicates internal chemical instability. The internal separator may be compromised. This makes it highly susceptible to short-circuiting under pressure or heat. Even normal use could trigger thermal runaway. Damaged batteries should never be flown.损坏或鼓包的电池表明内部化学性质不稳定。内部隔膜可能已受损。这使得它们在压力或高温下极易短路。即使是正常使用也可能触发热失控。损坏的电池绝对不应带上飞机。

Warning signs include overheating, swelling or deformation, strange noises like hissing, smoke, or a burning smell. If a device feels unusually hot or the battery case is bulging, it's dangerous. Passengers should stop using it immediately and notify crew. Never ignore these signs on an aircraft.警告信号包括过热、鼓包或变形、嘶嘶等异常声音、烟雾或烧焦味。如果设备异常发热或电池外壳鼓胀，那就是危险的。乘客应立即停止使用并通知机组人员。在飞机上绝不要忽视这些信号。

Spare lithium batteries must be carried in carry-on baggage only, never in checked luggage. Terminals must be protected from short circuits by tape or original packaging. For lithium-ion, under 100 Wh has no limit; 100-160 Wh needs airline approval. These rules prevent fires in the inaccessible cargo hold.备用锂电池必须放在随身行李中，绝不能托运。必须用胶带或原包装保护端子以防短路。对于锂离子电池，100瓦时以下无数量限制；100-160瓦时需航空公司批准。这些规则防止在无法进入的货舱内发生火灾。

Crew should immediately use a Halon or water extinguisher. Lithium fires require cooling, so water or soda water is effective. They should move the device away from flammable materials if possible. After extinguishing, they must cool the device with water or non-flammable liquid to prevent re-ignition. Thermal runaway can restart.机组人员应立即使用海伦灭火器或水灭火器。锂电池火灾需要冷却，所以水或苏打水有效。如有可能，应将设备移离易燃物。灭火后，必须用水或不可燃液体冷却设备，防止复燃。热失控可能重新启动。

Lithium battery fires are chemical fires that generate their own oxygen. They burn intensely and can reignite hours later. Traditional extinguishers may not fully stop the reaction. On an aircraft, escape options are limited, and smoke can fill the cabin quickly. That's why prevention and early detection are critical.锂电池火灾是能自行产生氧气的化学火灾。它们燃烧剧烈，数小时后可能复燃。传统灭火器可能无法完全阻止反应。在飞机上，逃生选择有限，烟雾可能迅速充满客舱。这就是为什么预防和早期发现至关重要。

Installed batteries in devices like laptops can sometimes be checked, but spare batteries are strictly prohibited in checked baggage. A fire in the cargo hold is hidden and difficult to reach until landing. By keeping batteries in the cabin, any incident can be detected and handled immediately by crew.装在设备如笔记本电脑内的电池有时可以托运，但备用电池严格禁止放入托运行李。货舱内的火灾是隐蔽的，在着陆前很难接触到。将电池放在客舱内，任何事件都能被机组人员发现并立即处理。

Actually, most airlines prohibit in-flight use. Lithium batteries generate heat during discharge. If a faulty battery overheats in a seat pocket or bag, it may go unnoticed until too late. By prohibiting use, crews ensure any incident happens when the device is visible. Early detection saves lives.实际上，大多数航空公司禁止在飞行中使用。锂电池在放电过程中会产生热量。如果有故障的电池在座椅口袋或行李中过热，可能直到为时已晚才被发现。通过禁止使用，机组确保任何事件发生在设备可见时。早期发现能挽救生命。

Crew should instruct the passenger to power off and hand over the device. They should place it in a fire containment bag if available, or on a non-flammable surface like a galley floor. Monitor constantly and prepare extinguishers. Never put it in an overhead bin where fire could spread unseen.机组应指示乘客关闭设备并交出。如果可用，将其放入防火袋中，或放在非可燃表面如厨房地板上。持续监控并准备灭火器。绝不要将其放入行李架，因为火势可能在看不见的地方蔓延。

I haven't seen a fire personally, but passengers have reported devices getting extremely hot. In such cases, we instruct them to power off immediately and monitor closely. Quick response prevents escalation. Crew training on lithium battery incidents is essential for cabin safety.我个人没见过火灾，但有乘客报告过设备变得极热。在这种情况下，我们会指示他们立即关闭设备并密切监控。快速响应可以防止事态升级。机组人员接受锂电池事件培训对客舱安全至关重要。

I would say: "Lithium batteries are safe when used normally, but if damaged they can overheat and catch fire. In the cargo hold, we couldn't see or stop that fire. By keeping batteries with you in the cabin, we can monitor them and respond immediately if there's a problem. This protects everyone on board."我会说："锂电池在正常使用时是安全的，但如果损坏可能过热起火。在货舱里，我们无法看到或阻止那种火灾。通过把电池放在客舱随身携带，我们可以监控它们，并在出现问题时立即响应。这保护了机上每个人。"

Power banks must be in carry-on baggage only. They are strictly prohibited in checked luggage. A fire in the cargo hold is harder to detect and suppress. In the cabin, crew can respond immediately. This rule is simple but critical for flight safety.充电宝必须放在随身行李中。它们被严格禁止放入托运行李。货舱内的火灾更难发现和扑灭。在客舱内，机组人员可以立即响应。这条规定简单但对飞行安全至关重要。

Crew should use a Halon or water extinguisher immediately. Lithium battery fires require cooling, so water is actually effective. They should move the device away from flammable materials. The key is rapid detection and response before the fire spreads to other items.机组人员应立即使用海伦灭火器或水灭火器。锂电池火灾需要冷却，所以水实际上很有效。他们应该将设备远离易燃物。关键在于快速发现和响应，在火势蔓延到其他物品之前控制住。

Passengers should check for safety certifications like CE mark. Avoid damaged or swollen batteries. Protect terminals from short circuits by using a plastic bag or original case. Never carry damaged power banks on a flight. Safety starts with personal responsibility.乘客应检查是否有CE标志等安全认证。避免使用损坏或鼓包的电池。通过使用塑料袋或原装外壳保护端子免受短路。绝不携带损坏的充电宝乘机。安全始于个人责任。

I explain simply: "For your safety, if a power bank overheats in the cargo hold, we cannot see it or stop a fire in time. In the cabin, we can monitor it and act immediately if there's an issue." This explanation helps passengers understand the logic behind the rule.我简单地解释："为了您的安全，如果充电宝在货舱里过热，我们无法看到也无法及时灭火。在客舱内，我们可以监控它，并在出现问题时立即采取行动。"这种解释帮助乘客理解规定背后的逻辑。

This announcement is for fire prevention. Lithium batteries generate heat when discharging. If a faulty power bank overheats during turbulence or in a seat pocket, it could ignite unnoticed. By prohibiting use, we ensure any incident happens when the device is visible. Early detection saves lives. Cabin fires are detectable; baggage fires are disasters.这个广播是为了防火。锂电池在放电时会产生热量。如果有故障的充电宝在颠簸中或座椅口袋里过热，它可能在无人注意的情况下起火。通过禁止使用，我们确保任何事件发生在设备可见时。早期发现能挽救生命。客舱内的火可以被发现，但行李中的火就是灾难。