The Physics
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Voltage of a Nickel Cadmium Battery

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Bibliographic Entry Result
(w/surrounding text)
Saft Nickel-Cadmium Batteries for Mass Transit Applications. SAFT Railway Technology. "Saft can offer now self-contained 24 V to 110 V battery units" 24–110 V
Battery (Secondary Cells): Encarta Online Encyclopedia. "It also produces about 1.15 V, and its useful lifetime is about 25 years." 1.15 V
Ni-Cd Batteries. Product Catalog. Radioshack. "Replace those old batteries with Ni-Cds and save money! 1.25 V, 600 mA hours." 1.25 V
Choice of Battery Chemistries. Cadex Electronics. "Cell voltage (nominal) - 1.25 V" 1.25 V

Batteries, how come they always run out so fast? As more and more mobile products such as cell phones, music players, computers and other electronic devices are produced; more batteries are needed. Someone (Waldmar Jungner) then came up with a bright idea of using rechargeable batteries. Instead of throwing the old ones away you can recharge them and they're like new.

One type of rechargeable battery is nickel cadmium. These batteries is about 1.2 volts but there are other batteries that contain up to 110 volts for various uses. Ni-Cds can be recharged about 1000 times. However, there are problems with rechargeable batteries. This problem is called the "memory"effect. "Memory effect"basically is if you use a battery and its not fully discharged before you recharge it again you may not be able to use the battery past the point where you used it up to before. For example, if you have fully charged battery and use it till there 50% of energy left then recharged it and do this repeatedly. The battery will somehow remember and think that that 50% is its capacity point. Then you will not be able to discharge the battery past the 50% point and these batteries would not be able to run as long as it did before. But! Some experts deny that this effect is true. They believe batteries have less capacity mainly because of overcharging. Batteries having the ability to "remember"is largely a myth (see:

Anyway, rechargeable batteries can be bought in Various sizes in a local electronic store near you. Standard pack of 2 AA Ni-Cd batteries would cost around $5.50 (Radioshack price). They are great to use and less expensive than regular batteries. So buy a pack today but BEWARE of the "memory"effect.

Johnny Lee -- 2001