replacement NiCad batteries

Ill ask the experts here . web is overloaded with info cant decide
I want to replace my ni cads in my drill 18v batteries inside have em22nf on them . I don't find any info on that part.
1 5/8" long 1/2" od
please advise

Depending on the exact diameter, they are likely "4/5 AA" or "4/3 N" size...

See the chart here:

Just for info, you can get battery adapter units for quite a few of the bigger name 18V NiCd type power tools, that allow the newer standard 18V or 20V lithium power tool batteries to be used.

The lithium packs have a working voltage range from full charge to fully discharged that fits neatly within the voltage range of the original NiCd on NiMH packs, so work perfectly. You do need to charge the battery on the proper lithium charger though.

You might have a look here, and see if you can spot the correct sized ones.

thanks for the replies I have look at both of those sites