You can extend the cleaning time of your Kogan Z15 Pro Cordless Stick Vacuum Cleaner by using a spare 29.6V lithium battery. This battery is lightweight and has a high capacity, and it can be charged quickly for up to 3 hours. You can double the battery life of your vacuum cleaner by having a spare battery at hand. It also has protection against overcharging, overheating and short circuits, and it is compatible with the Kogan Z15 Pro Cordless 29.6V Stick Vacuum Cleaner.