Cheaper battery is likely using less sophisticated and less fine-grained materials that result in higher internal impedance, which results in less output voltage under the same load, and therefore "less power". Order from Medic Battery to ensure your Duracell AA battery life is fresh as soon as you order your shipment. Lithium-ion batteries are better batteries because they are rechargeable. ![]() The remaining 990+ charge cycles do not cost users a penny. Duracell AA battery life is reliable and long-lasting compared to cheap, generic brands. Even though Pale Blue Earth batteries cost 4 to 5 times as much at the cash register, they pay for themselves within half-a-dozen recharge cycles. The actual difference in internal impedance between your two batteries is not that much, according to your measurements, no more than a factor of two.Īnd the hypothesis #2 is essentially the same as the first one. Alkaline battery life is so dependent on how the batteries are used, and there are no standards. So the internal impedance is of least concern as long as the battery serves its main purpose. Their capacity is 300-400 mAh, and devices are expected to last years. Given the battery's small physical size and necessity to have 6 primary elements inside (6S configuration), they just can't possibly deliver high current, and are intended to use in long-lasting low-current consumer devices as smoke detectors and DMMs, with consumption in a fraction of milli-amp. ![]() 9-V batteries are not designed to deliver high current and heat some heating coils.
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