I have 2 IBM 600e laptops. They each have 2 batteries. First one operates the computer and accessories, in place of using the wall outlet. Its what makes the laptop truely portable. Its heavy, black, and contains 8 or 9 battery cells, similar to “AA”. They are very expensive to replace.
The second battery, is similar in size to a coin. It sits on the mother board itself. Its located very close to the memory chips. Has a red and a black wire lead, from the battery to the motherboard. This is known as the CMOS battery. It remembers
all the instructions required by your Bios, to start-up and continue using the laptop. These are very inexpensive. I have found a discount store that sells them for $1.00. At that price, they come without the wire leads. $4.00 dollars with the leads is a great price.
What is wrong with your 600? If it doesn’t start up, then you will require the purchasing of the larger more expensive battery.
If it turns on, but, doesn’t go beyond the testing, and date and time, then you need the small CMOS battery.

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