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Original lead–acid battery pack. The original version of the tZero roadster ran [when?] on 28 Johnson Controls Optima Yellow Top spiral wound AGM deep cycle lead–acid batteries in series, which produced 150 & 165 kW (220 horsepower) and 177 lbs·ft (240 N·m) of torque at 336 volts and accelerated the 1,040 kg (2,290 lb) car from a standstill to 60 mph (97 km/h) in 4.07 seconds.
A deep-cycle battery powering a traffic signal. A deep-cycle battery is a battery designed to be regularly deeply discharged using most of its capacity. The term is traditionally mainly used for lead–acid batteries in the same form factor as automotive batteries; and contrasted with starter or cranking automotive batteries designed to deliver only a small part of their capacity in a short ...
Under certain conditions, some battery chemistries are at risk of thermal runaway, leading to cell rupture or combustion. As thermal runaway is determined not only by cell chemistry but also cell size, cell design and charge, only the worst-case values are reflected here. [64]
Starting batteries are lighter than deep-cycle batteries of the same size, because the thinner and lighter cell plates do not extend all the way to the bottom of the battery case. This allows loose, disintegrated material to fall off the plates and collect at the bottom of the cell, prolonging the service life of the battery.
Deep-cycle batteries are also used as auxiliary batteries in recreational vehicles, but they require different, multi-stage charging. Discharging below 50% can shorten the battery's life. [ 36 ] Flooded batteries require inspection of electrolyte levels and occasional replacement of water, which gases away during the normal charging cycle.
Deep-cycle lead–acid systems often use a low-charge warning light or a low-charge power cut-off switch to prevent the type of damage that will shorten the battery's life. [68] Battery life can be extended by storing the batteries at a low temperature, as in a refrigerator or freezer, which slows the side reactions.