Which is better nickel cadmium or lithium ion?
Likewise, is NiMH better than lithium ion?
NiMH batteries offer a higher capacity than Nicad batteries, and less capacity than Li-Ion. They are nearly twice as heavy as Nicad batteries. They also don't have a memory effect. They are very similar to nicad when it comes to charge and discharge characteristics, and are safer than Lithium ion with thermal runaway.
Likewise, are NiCad and lithium ion batteries interchangeable?
Answer: It is not the same, but they are interchangeable. The PC18BL is a lithium-ion battery and the PC18B is a NiCad battery. They use the same chargers and will work on the same tools.
The most economical lithium-ion battery in terms of cost-to-energy ratio is the cylindrical 18650 (size is 18mm x 65.2mm). This cell is used for mobile computing and other applications that do not demand ultra-thin geometry. If a slim pack is required, the prismatic lithium-ion cell is the best choice.