Unfortunately I’m not sure this article is good, as it doesn’t seem technically sound.

Disclaimer, I was expecting an article with such a title to talk more about silicon anode batteries, or perhaps LTO (lithium titanate oxide) batteries that can charge in about 6 minutes (10C). It’s fine that the article doesn’t talk about that… however some of its other claims are a bit problematic.

> In such a situation, the best solution is slow charging, for which a low-power charger from your old feature phone is ideal. These devices offer a small power output of 2–5 W, stretching the charging process to 5–7 hours depending on the adapter's power and the battery capacity. This way, your phone's battery charges under the best conditions, minimizing degradation. Fast charging leads to up to 1.6% battery degradation every 100 days, according to an experiment comparing 5W and 25W charging on six identical smartphone batteries.

Sorry but that’s not the correct conclusion (or advice). Fast charging to 80% at cool temperatures will give a much better lifespan than charging slowly to 100% in a warm room. The issue isn’t charging speed, it’s the heat, along with time of strain (at high SOC). In fact there are pulsed very high speed charging patterns under testing that show even lesser dendrite formation than standard charging.

For anyone wanting to learn more, I highly recommend battery university. They’re probably the best resource out there on the net for genera purpose info on lithium batteries.