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Agreed that this is sensible...
1) I seem to recall that VBAT can go as low as 1.5V and still power the RTC et al. Not verified.
2) We are discussing this only for battery voltage indication, so an offset of say 0.6V will drop the low end of the battery from, say 3.3V? (not sure when the IP5303 quits) to 3.3-0.6 = 2.7V, which, if I recall the 1.5V value correctly, will still power the RTC if we wind up caring.

So VBAT will range from 4.2-0.6 (nominally) = 3.6V to 2.7V(?) before the IP5303 quits. If the software assumes a 500mV drop, and I wind up with 700mV, will I really care? Well, LI batts have a fairly flat discharge curve, so that 200mV difference might count. If I can enter this into the device, I am good to go. All I have to do is measure the diode drop accurately.

I appreciate all the advice. I have the battery icon, but no charge indication, so I am looking at doing something.

~R~

--
On the banks of the Piscataqua
Rich NE1EE