The battery voltage of each cell point of view, are nickel-metal hydride and nickel cadmium 1.2V, while the lithium battery is indeed as 3.6V, lithium battery voltage is 3 times the other two. And the weight of the same type of lithium batteries and nickel cadmium batteries is almost equal, while heavier than nickel-metal hydride batteries. We can see that the weight of each different battery itself, but because of 3.6V lithium battery high voltage, in the case of the output voltage equal to the number of combinations of single battery can be reduced one third leaving after forming the battery weight and volume decrease.
Nickel-metal hydride batteries for constant current charging pick cut control the charging voltage reaches the maximum when to stop the charge as the best way to charge
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