I’m with Andrew here, in an ideal world your LiPo cells would always be stored at 3.5V and only be operated between 3.2 and 4.2V. The PCM will prevent the battery from being drained to a non-rechargable state but won’t prioritise the lifespan of the battery as it’s more of a safety fallback.
Using a device that has fuel gauge ICs and dedicated LiPo circuitry built-in is preferred but does add to the cost of the end devices so it’s understandable why a lot of low-power devices omit it.
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