【10000mAh Power Bank 】 This 10000mAh portable chargers are small enough to go into any pocket or backpack. These battery packs are powerful enough to last the entire day. 【Reliable Li-polymer Cell】 A high-quality Li-ion battery included into the battery bank helps to charge it safely and prevents over-voltage, over-charging, over-current, and short circuits, among other things. It won't become too hot or put a lot of strain on your phone's battery. More importantly, these phone charger battery pack portable are also airline-approved【Small & Slim】These power banks are popular for travel since they are exceptionally tiny for a 10000mAh power bank, weighing just 218g and measuring only 12mm thick. They come in handy on any.