![]() If the battery can maintain a consistent voltage, then the current or flow rate remains the same for the life of the battery. Think of voltage as the water pressure supplied to the pipe while the current (measured in amps or mAh) is the flow rate. ![]() A simple analogy to understand the two components is to imagine water moving through a pipe. The two most important things to consider in a battery are voltage (volts) and current (amps). Tenavolts AA lithium rechargeable batteries deliver 1.5V from the moment you put them in the device until they stop, and they can then be recharged to full capacity in just under two hours. But the inability for traditional NiMH (nickel metal hydride) batteries to reach the voltage of a single-use alkaline battery at 1.5V or even maintain their 1.2V level for the operating life of the battery is an issue for some, particularly if you're powering devices that house four or more AA or AAA batteries. If used well, rechargeable batteries are an undeniably better environmental option compared to single-use alkaline batteries.
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