Street Photography Using Flash

AAAARRRGGGHH, This is the 3rd time I am writing this post because my blog keeps on crashing. So, as I was saying twice before, currently I am using a Fuji EF-X20 flash to shoot street. I really enjoy the compact size and solid build of it but the downside is that it doesn't last very long before I need to change batteries. I am looking for another option if anyone has good experiences with a small flash suitable for street photography then send me a message.