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A growing use is in alkaline zinc manganese dioxide primary batteries.
Batteries are divided into two general groups: (1) primary batteries and (2) secondary, or storage, batteries.
Power can be provided by expendable primary batteries, which need to be replaced every year or two.
Though it can operate for 60 hours on primary batteries, the probe must then switch to its main batteries which need to be recharged through its solar arrays.
Nonetheless, compared with many primary batteries and even lead-acid batteries, nickel-cadmium batteries are heavy and have comparatively limited energy density.
Primary batteries are designed to be used until the voltage is too low to operate a given device and are then discarded.
Similar(23)
Once its primary battery drained, Philae would go silent.
Everything had to be completed within the 60-hour lifetime of the primary battery.
This cell was the first primary battery used for the production of electricity.
Even once one figures out how to extract the primary battery, there may be additional power sources within the apparatus.
The mission became a race against time to collect all the science it was designed to do in the first 60 hours, the lifetime of its primary battery.
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