FireCubeStudios
commented
2 years ago As an example, divide charge rate by battery capacity to get %/hr: 19 W / 37 Wh = 0.51/h = 51 %/hr. This is much more useful because I can easily see that I'll get ~50% in an hour of charging, ~25% in 30 min, etc. rather than seeing 19W and having no idea what that means. Note that the 51%/hr number is also consistent with the 1:29 to full estimate, indicating that the formula is correct and you should divide by the degraded capacity of 37Wh, instead of design capacity of 45Wh.
C-rate is a similar term battery scientists use, but is based on current, and expressed only as a number without units: 0.51. It should be based on current and charge (mA and mAh), not power (W and Wh), and therefore would not account for degradation, but most people probably want to use energy and account for degradation. Anyways, for C-rate, assuming this is a 3.7V * 3 = 11.1V battery, you'd do something like 1700mA / 4000mAh = 0.425/h, and give the C-rate as 0.425
https://www.reddit.com/r/windows/comments/y0dmap/comment/irrde21/?utm_source=share&utm_medium=web2x&context=3
Use watts instead of watt/hour