battery charger

例句：

1. 1.This battery charger is very convenient for charging my phone.
   这个电池充电器对我来说充电手机非常方便。
2. 2. The power bank is small and lightweight, making it easy to carry around.
   这款移动电源体积小且轻便，携带起来非常方便。
3. 3. I always bring a portable charger with me when I travel, just in case my phone runs out of power.
   我旅行时总是带着便携式充电器，以防我的手机电量耗尽。