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In recent years, portable electronic devices such as gadgets, tablets, mp3 players grow rapidly as daily devices for supporting people activities. In many applications, portable electronic devices need power backup. Since wireless power technology has been introduced in mobile device applications, portable power backup has become more popular to extend the battery life of mobile devices, moreover, the power backup technique also can utilize the advantages of wireless power technology. This paper presents the development of a dual-mode power bank: wireline and wireless, especially for gadget device power charge applications, to enhance user experience. The power backup is stored in a Li-ion rechargeable battery where the power in-outlet is monitored by the power monitoring module. The developed device was designed in a compact, simple, and portable module in the fashionable casing regarding the wireless power bank device. Concerning the wireless system, it was also designed based on Qi-standard Wireless Power Consortium (WPC), working at an operating frequency of 110kHz, maximum transmission distance at 10mm, and providing power at 5W. Experimental and validation reveal that the device can provide power 5V at maximum current 1A. The power transfer efficiency is around 70% and compatible with Qi-standard wireless power charger either modular or built-in inside portable electronic devices. [ABSTRACT FROM AUTHOR]