Based on your need for a flash battery, I would recommend either the 20000MAH Portable Power Bank Battery Charger for R749 or the Go Fast 30000MAH Power Bank for R689. Both of these products are high capacity portable power banks that can charge your phone multiple times on a single charge. They would be great for keeping your phone powered while on the go. The 20000MAH and 30000MAH capacities mean they can store a lot of power to charge electronics as needed. I hope one of these power bank options could work well for your flash battery needs! Please let me know if you would like me to suggest any other products.
