Hi there,
I’m wondering if this might explain away some of the Vampire current
(from the data sheet)
“Note 1: Supply current includes ISET pin current (approximately 100μA) but does not include any current delivered
to the battery through the BAT pin (approximately 100mA).”
I’m surprised at some of the Technical design decisions seeed engineering has made with features supported but not implemented correctly or poorly SMH, i.e. devices you can read battery level seems to be their achilles heal.
my.02
GL 
PJ