NICAD(Nickel Cadmium) batteries were very popular in their day, but now are obsolete because of NIMH(Nickel Metal Hydride) batteries. NICAD batteries suffered in available capacity,they were susceptible to memory effect, and not to mention they are not environmentally friendly. Nicad batteries contain toxic cadmium. Nicad batteries needed to be fully discharged before charging again to 100%. On a cordless drill for example, if you used half the battery working on a project and then charged it back up again for the next day the NICAD batteries would start using only 50% of their capacity thinking it was 100% charged. NICAD batteries however were hard workers if you drained them all the way down and took them back up again to 100%. They would take a lot of abuse of heavy cycles, time after time but lacked high capacity. Nicad batteries had around 750 charge cycles in them.
Nickel Metal Hydride is an excellent replacement to Nicad. Nickel Metal Hydride has no memory effect, so they came be charged back up at any time with no worries. NIMH also contains no toxic cadmium, and are environmentally friendly. NIMH offers 2 to 3 times the available capacity over Nicad batteries. NIMH are a excellent choice for high drain electronic devices like digital cameras. NIMH batteries have 1000 plus recharge cycles in them, making them a power house in the rechargeable sector. One of the draw backs to NIMH batteries however is their discharge rate when not in use. NIMH have a high discharge rate, and for that reason are a bad choice for emergency applications like backup flashlight batteries in cellars. NIMH batteries are a great improvement over Nicad batteries, and are a excellent choice for your next battery purchase.
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