Battery Type	Maximum Energy Density Wh/kg	Maximum Power Density w/kg	Operating Temperature	80% Discharge Cycles Before Replacement	Approximate production cost $ per kW/h	Commercial Availability
Lead Acid	35	150	ambient	1000	50	1997
Advanced Lead Acid	60	350	ambient	2000	150	2000
Nickel Cadmium	50	200	ambient	2000	500	1997
Nickel Metal Hydride	80	200	ambient	1200	200	Now
Sodium Nickel Chloride	120	150	300	> 1200	200	Now
Lithium Polymer	155	315	120	300	50	Prototypes
Aluminium Air	200 - 300	160	ambient	-	-	Prototypes
Nickel Iron	50	100	ambient	200	2000	1997
Iron Air	80 - 120	90	-	500+	80	Prototypes
Nickel Zinc	70	170	ambient	300	550	2000
Sodium Sulphur	150	230	350	1000	450	2000
Lithium Iron Sulphide	150	300	450	1000	200	Prototypes
Lithium Iron Phosphate	?	?	?	?	?	Smith prototypes
Lithium Ion	80 - 130	200 - 300	-	1000+	350	Now
Zinc Air	200	80	ambient	600	200	Prototypes
Zinc Bromide	80	100	-	1000	400	Prototypes
Vanadium Redox	20-30	110	75 - 85	-	800	Prototypes
Molten Salt	110	125	350	-	-	Prototypes
Flywheels	90	4000	Ambient	1,000,000	?	?
Supercapacitors	15 - 50	1600-5,000	Ambient	1,000,000	?	1997
Clockwork	0.13	500	Ambient	500	?	?

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