 Hello, this is LaptopMedia, and today, we will show you how to open the Dell Attitude 155521 and what's inside of it. This machine's bottom panel is held in place by 9 captive Philips head screws. After you undo them, you need to pry the bottom panel. We found it the easiest to start from the back. Please remember, it would be of great help to us if you just hit the like button and subscribe to our channel. That would motivate us to make even more and better videos for you. Inside, we found a 64 watt hours battery. It lasted us for almost 9 hours of web browsing, or nearly 7 hours of video playback. By the way, some options include a larger 97 watt hours unit, which takes the space dedicated for an optional 2.5 inch SATA drive. To take the battery out, you need to unplug the connector. Then, undo all three Philips head screws and remove the unit from the chassis. Memory-wise, there are two Sodom slots. They can fit up to 64 GB of DDR4 RAM. As for the storage, besides the optional 2.5 inch slot, there are two M2 PCI-EX4 slots. One of them supports Gen4 drives as well. Finally, there is the cooling. It comprises two very long heat pipes, which lead to a side-mounted heatsink. The heat is then blown away with a single fan, which has a pretty thick profile. If you'd like to see more disassembly videos of the latest notebooks we would highly appreciate if you hit the like button and subscribe to the channel.