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The size of ATX power supply can be classified into two sizes. The power supply with 120mm fan and one with 140mm fan. 120mm has smaller dimensions and most time has CPU power plug 8 pin(4x4) for powering CPU, and 140 mm has CPU power plug 8 pin(6x4). If you want to install newer video card for PCI-e 2 or 3 you need at least 600W or higher supply. If your computer case has ample space for bigger size power supply, would recommend it since you need more than minimum to power all the components of your computer.
Sorry, there was a problem. Please try again later.First off it is not a battery, it's a power supply, and no they are not all the same size, but it this one is similar in size to a standard 400w PSU. The picture I attached will give u an idea of it's size if u are un-shure.
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