Battery Grip +
![Battery Grip](https://files.ozbargain.com.au/t/58/41258.jpg?h=08388a2c)
A battery pack is an accessory for an SLR/DSLR (and occasionally other cameras), which allows the camera to hold multiple batteries to extend the battery life of the camera, and adds a vertical grip with an extra shutter release (and other controls), facilitating the shooting of portrait photography.