It's an old article, but still mostly correct. Several developments have changed the landscape over the past decade. The Chinese have pretty much taken over the battery manufacturing industry. As a result, the quality of many low-production battery series has gone down dramatically. Some cells that once had a 10-year shelf life will now be completely useless within two years. A more positive development has been the improvement in power electronics. Quality consumer electronics will now often include power conditioning circuits so the "cut off" voltage from a battery is no longer relevant. The batteries can now continue to power the device until they are completely discharged. (See: https://www.ti.com/tool/TPS61280EVM-585)