Nickel Cadmium and Nickel Metal Hydride types both have problems with what is known a memory effect, repeated partial discharge and recharge may cause battery to 'remember' the point where recharging usually starts, and hang this as its base point. This false empty cuts down on the amount of charge the device holds.
Some algae species are 50% or more lipid oil by weight. This oil may be pressed from the algae and refined into diesel. The process for extracting algal oil, at its simplest level, resembles pressing an olive. Up to 75% from the oil might be squeezed from algae using a simple mechanical press. Hexane might be used being a solvent to raise extraction up to 95%. Once extracted, the oil is refined through transesterification. A catalyst including sodium hydroxide is combined with alcohol to make biodiesel and glycerol.
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