Originally Posted by BumbleAbout
Many of the NiCad packs are "simply" 4 or 5 NiCad batteries soldered together inside a shrink wrapped plastic holder
Make that "just about all".
I pretty much stay away from NiCad batteries unless I absolutely can't avoid them. I hate the memory effect they develop after you recharge without running them dry.
If you can get the battery pack apart and see how it's constructed, you can *usually* substitute NiMH cells for the NiCad cells directly with just a slight loss of charged voltage, a slight gain in endurance (except for shelf life), and little to no effect when charging.
Or, you can purchase a replacement battery and be done with it.