Battery comparison chart

Key Features World's longest lasting AA and AAA batteries in high-tech devices Protects your devices from leakage of fully used batteries up to 2 years (AA/AAA) Lasts up to 165 photos** and up to 500 minutes in handheld gaming*** per one full charge for AA battery Lasts up to 350 photos** and up to 380 minutes in toys*** per one full charge for AA battery

The L91 is initially 1.6+ volts under NO LOAD conditions. In fact the Pulse Response test shows it can when new be as much as 1.8V no load voltage. Note that the 1.5V is listed as NOMINAL VOLTAGE but the graphs show how that varies with time and loads. Under the drain of a LED flashlight it falls rapidly to about 1.5 volts but under the same current draw the 1.5 volt alkaline battery drops to considerably lower than 1.5V as it has much higher internal resistance. The Ultimate Lithium can provide much greater voltage and current under high load conditions, as can the best quality NiMh rechargeable batteries such as Eneloops but the Eneloops do it at 1.2V nominal.

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Download the E91 Alkaline battery PDF and compare them. Under any real current load the E91 falls on it&#;s face. The link is in the Specifications area on the L91 PDF you linked to in your post. The light gets hotter because the L91 is a much higher current capable device that SUSTAINS its nominal voltage under higher current drain conditions. It continues to allow the light to run at the output level that alkalines only provided for a few minutes or less.

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