I forgot to take the mobile charger.

我忘记带手机充电器了。

youdao

He forgot the charger for his mobile phone.

他忘了带手机充电器。

《柯林斯英汉双解大词典》

Mobile phone companies should consider whether a new charger is now needed with every handset if an old one after the unified standard can be recycled.

如果统一标准后的旧充电器能被循环利用的话，移动电话公司应该考虑是否还需要为每部手机都配一个新的充电器。

youdao

This could radically simplify the mobile charger industry and decrease the costs and complexity of cables for charging mobile devices.

FORBES: New Technology and Investment Opportunities at the 2011 Intel Developers Forum

When he returned with my coffee, I got my answer in the form of a mobile battery pack with an Android charger attached.

FORBES: Chuck's Manufacturing: An Entrepreneur's Oasis in Chicago's Loop

This Japanese car (right-hand drive in the version I piloted) is coming to the U.S. in slightly enlarged form, and I was able to plug it in to a mobile, truck-mounted fast-charger (at left) that can get it mostly ready to go (80 percent) in 20 minutes.

FORBES: Hyundai, Mitsubishi, Nissan Electric Cars At LA Auto Show