On 29/11/2020 20:35, Paul wrote:
Fractional filling will add some life to the battery pack.

It's the same with laptops. Laptops in the past charged to 100%,
and some people left their laptop plugged in all the time. Even though
the charger is smart, this tends to wear on the pack. More modern
laptops have a "stage 1 only" charging option, which charges the
pack to 80%, and then if you leave the adapter plugged in, the
smart charger will never put more than 80% in. Which reduces the
terminal voltage so it spends less time at 4.2V and more time
at 3.7V (LiCo).

I'm sure this is explained in the documentation somewhere.

https://accubattery.zendesk.com/hc/e...nd-methodology

I should however point out that the above link is part of the
documentation for the Android Accubattery charge monitoring app so may
be biased.