Genuine 25. 2V Lithium Battery Pack for AEG Ultra Power AG 5012. Ultra Power is designed and built to last. However, with time, batteries may lose their ability to perform at their original level. With the exchangeable battery pack feature, you can easily change to a new one if it starts to fade, instead of having to buy a new cleaner. If you have a large home or need to clean for longer, you can also buy an extra battery pack and double the running time. This battery lengthens your cleaner\'s run time with up to 60 minutes. This pack contains one Ultra Power Lithium Battery 25. 2V. AEG reference known as AZE 033.