Battery life champion. yep, THL 5000 built-in a 5000mAh battery ( THL 4400 4400mAh) only after you took chances to see how long it goes again and again and not be disappointed that someone says that.they use well calibrated scientific tools to measure things like display quality and battery life. Remember my recent rants on battery life of modern smartphones? The big advances in battery technology happen rarely. It's been more than 200 years and we have maybe five different successful rechargeable batteries, said George Blomgren, a former senior technology researcher at eveready and now a private battery consultant. It's frustrating.