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Following is a summary of the characteristics of popular battery technologies. For more details, see lead acid, nickel cadmium, nickel metal hydride, lithium ion, lithium polymer, zinc air, CMOS battery and memory effect.

 CHARACTERISTICS OF RECHARGEABLE BATTERIES
 Recharge Fast Self
 Energy Cycles Charge Discharge
 Density To 80% Time Per
 (Wh/Kg)* Capacity (hours) Month
Nickel
Cadmium 45-80 1500 1 20%
Nickel
Metal
Hydride 60-120 300-500 2-4 30%
Lithium
Ion 110-160 300-500 2-4 10%
Lithium
Polymer 100-130 300-500 2-4 10%
Lead Acid 30-50 200-300 8-16 5%
 To 50%
 Capacity
Reusable
Alkaline 80 50 2-3 0.3%
This data are provided courtesy of
Cadex Electronics Inc. (www.cadex.com).
* Wh/Kg = watt hours per kilogram






A Whole Lotta Batteries
This roomful of lead acid batteries stands ready to drain itself entirely in less than a minute. It serves as interim power for a large datacenter between the time a power outage has been detected and the generators can come up to full speed.
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