Going back to original query.
Ignoring all of the technical jargon, it could be that the GPS is
using power faster than it can be replaced.
According to the battery utility app on my Samsung Note 10.1 it takes
a very low battery in excess of 2.5hrs to charge on a mains charger,
but with a full battery the GPS will only function for 1hr and
39minutes. So the GPS is using power faster than even a mains
connection can replace it, it would be even faster with a USB
connection.