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RE: Why is Anybody Still Using Disposable Alkaline Batteries in 2017?
https://ripitapart.com/2015/06/17/performance-analysisreview-of-kentli-ph5-li-ion-1-5v-aa-battery/
This analysis suggests the capacity is not all it is claimed for those Kentli Li+ AAs.
This is why, and it's an unavoidable problem with making 3.7 volt cells work in devices designed around 1.5 volt alkaline batteries. They still have the useful advantages of lighter weight, faster charging and apparently greater voltage stability.
18650s do not have this problem as they are used in devices designed around their native voltage.