Battery and type of machine T420

I want to buy a new battery 9 cells for my lenovo t420 and I wanted to know the machine type important when buying the battery is? For example, my machine type is 4178-A2G. The battery is supported by lenovo t420?

Thanks in advance for the help!

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type of machine as xxxx-xxx is not important in the management of battery. T420 uses all of the same type of battery.

Tags: ThinkPad Notebooks

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