I just pulled this off the web. Hope it helps some you with questions you've had about which is better, NiCAD or NiMH.
Nickel Metal Hydride (NiMH) batteries are relatively newer technology and also do not suffer from memory effect. Compared to a NiCad battery of equal size, a NiMH battery will run for 30-40% longer on each charge. Also important from a driver’s perspective, NiMH batteries can be 50% recharged in just 15 minutes, and up to 90% in 1 hour using a car charger. The unique NiMH chemistry enables the packing of twice as much energy into a given mass than is possible with NiCads. This can also result in NiMH batteries having up to twice the life span of NiCads. NiMH batteries rank as the "best value" of all cellular phone battery types. Their trouble free service, longer running times and reasonable price has made Nickel Metal Hydride the most popular battery type for cellphones. Additionally, NiMH batteries are made from non-toxic materials and are environmentally friendly.
