Replacing a Toshiba PA3356U battery for Satellite A55 laptop computers will be an easy, inexpensive process when you buy the replacement battery at USB Phone World. Our selection of replacement batteries is priced much lower than retail and each battery listing includes detailed information allowing you to make an informed decision on the best battery for your laptop. Our 6-cell PA3356U replacement batteries have a capacity of 4400mAh and weigh slightly less than 300 grams. All of our batteries have been manufactured using the latest lithium technology which has resulted in batteries that are lighter yet more powerful than the original Toshiba batteries. You should see slightly longer charge times from our replacement batteries than the original Toshiba batteries as our cells are guaranteed to meet or exceed OEM specifications. When searching for Toshiba replacement batteries, your best bet in selecting the correct battery for your laptop is to search by your battery’s original part number. For example, if you enter PA3356U into the search field at USB Phone World, you will be taken to a page showing all of the compatible batteries for your laptop. In addition to 6-cell batteries, we have 9-cell batteries that are compatible to Satellite A55 systems. Replacing a 6-cell battery with a 9-cell battery will give you about 33 percent more charge time, resulting in less time spent connected to an AC adapter.