The escalation of power system promotes the development of battery technologies with its huge application market. Redox flow batteries (RFBs) are very attractive to customers in the energy grid system, and their noticeable technological innovations in the past decades have driven them to gradually replace the conventional energy storage methods under certain circumstance. Portable batteries used in electronics and fully electric vehicles ought to be designed to fulfill the growing desires on supplying energy quicker and longer. Therefore, many significant improvements have been achieved on battery manufacture and mechanism optimization. Here, the first fully-flow-able zinc–nickel flow battery (ZNFB) is studied, whose performance is supposed to be suitable for various scales. Through using semi-solid fuel cell (SSFC) technology, we incorporate the beneficial features of aqueous Zn/Ni chemistry (essentially sustainable, eco-friendly and deposit-abundant) into RFB structure to make a “hybrid” flow battery system with nano-size carbon network. Basic electrochemical properties of ZNFB are reported, and its suspension and electrode characters have been studied and improved.