Question

What is the largest lithium ion battery?

Answer 1

3.7V rechargeables cannot be used in place of 3V primaries for incandescent lamps. The extra voltage will blow the lamp. Most regulated LED's can handle 3.7V replacements.Oct 31, 2009');})();(function(){window.jsl.dh('_9mSRYP_SKbG-0PEP9e6lmA079','

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Search for: How long does a 3.7 V lithium battery last?

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about 2-5 hours

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About 18650 3.7v li-ion battery, it can last about 2-5 hours on high mode. It depends on the actual capacity of the battery.