Hello,
today I was using the FP5 to navigate to work, and the battery plummeted from around 45% to 2% within the span of ~20-25 minutes.
So I took to calibrate the battery. Most guides for this say to let the phone die on its own, and then recharge it while it’s still off, letting it sit at 100% for a while.
When it finally died after being on 1% for 5 hours of use I plugged it into a fast charger, and it started up on its own. This seems to be reproducible behavior, so I imagine this is expected.
I turned it off manually and let it charge while off. The phone started displaying the battery percentage as a fullscreen graphic.
However it stopped charging at exactly 80%, and the charger reported 0.0W of outgoing power.
I just turned it on and it seems to charge further now, drawing around 2-3W (the charger can provide up to 250W via PD/PPS). At this rate, the last 20% will take around 3 hours to fill if the estimation on the phone can be believed.
Which brings me to the question:
What is the actual procedure for calibrating the battery on the FP5?
Should I have turned it off? Do I let it trickle-charge to 100% or am I already done?