Battery Comparison

Battery Type	NiCd	NiMH	SLA	Li-ion	Li-Polymer
Energy density (Wh/Kg)	50	75	30	100	175
Cycle life (typical)	1500	500	200-300	300-500	150
Fast-charge time	1 1/2h	2-3h	8-15h	3-6h	8-15h
Self-discharge	medium	high	low	low	very low
Cell voltage (nom.)	1.25V	1.25V	2V	3.6V	2.7V
Load current	very high	medium	low	high	low
Exercise req. (days)	/30	/90	/180	N/A	N/A
Battery Cost	low	medium	very low	very high	high
(estimated, ref., $)	50.00	80.00	25.00	100.00	90.00
Cost per cycle ($)	0.04	0.16	0.10	0.25	0.60
In comm. use since	1950	1970	1970	1990	1997

'Energy density' is measured in watt-hours per kilogram (Wh/kg).
'Cycle life' indicates the typical number of charge-discharge cycles before the capacity decreases from the nominal 100% to 80%
'Fast-charge time' is the time required to fully charge an empty battery.
'Self-discharge' indicates the self-discharge rate when the battery is not in use. "Moderate" refers to 1-2% capacity-loss per day.
'Cell voltage' multiplied by the number of cells provides the battery terminal voltage
'Load current' is the maximum recommended current the battery can provide. "High" refers to a discharge rate of 1C*; "very high" is a
current higher than 1C*.
'Exercise requirement' indicates the frequency the battery needs exercising to achieve maximum service life.
'Battery cost' is the estimated commercial price of a commonly available battery.
'Cost-per-cycle' indicates the operating cost derived by taking the average price of a commercial battery and dividing it by the cycle
count.
'In commercial use since' is the approximate year when the battery became commercially available.

The above information has been reproduced from http://web20.mindlink.net/cadex/link.htm . More information is available there. (Please note that Cell refers to the individual cell, battery refers to the built battery that contains multiple cells)

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