Hi,
Here is a link to the service manual for a Lenovo S430 laptop.
On p.64 it details how to disable the built in battery '''before '''you begin to work on the laptop.
On p.83 it lists the prerequisites and procedures necessary to remove the battery pack.
Read the ''Important notices for replacing a battery pack'' information '''''before''''' you think about opening your laptop to remove the battery pack and installing a replacement.
https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/s430_hmm_en_0b48762_01.pdf