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Hi, colleagues.
Several years ago I had three cordless drills out of work due to their collapsed 9.6 volts batteries. The replacement batteries were very expensive or out of production.
I gathered an AC/DC transformer and a female DC connector to modify one drill. A pair of wires were soldered to each drill´s pole keeping the right polarity. I used a small shrinking sleeve to identify the positive pole. Once I tested the job I modified the other two drills.
Now they are ready to work.
Two other cordless drills are ready to be modified. More details are in the attached pictures.

 

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More pictures.

I repacked the NiCD cells of my 7.2V and 18V cordless drill with 3000mah NiMH cells of same size ordered from HK via ebay. They are not very expensive and one charge will last much longer than the original NiCD batteries.. Some solderings needed,
So I recommend that you try keep ONE drill as a cordless drill by repacking with Nimh cells of the same size.

Thank you Reuelt.
I agree with you. I have two Bosh cordless drills that I want to keep as they are. Here, in my country, we do not have many options to choose from to change the batteries, S&H to bring them from another country is expensive.