Can someone please post link to voltage-watching tutorial.
I assume its displayed on my P4P+ RC screen.
(FWIW, I fly up to take photos, then down & land, never
do any racing or pushing of drone's limits

)
Data point for those with pillowed batteries:
I put OP battery in -4F freezer a few hours;
it came out perfectly flat, no pillowing at all;
a couple days passed, no flying, some pillowing returned;
as I reported, up-down + pull motion at same time as
I press battery release buttons gets battery out
about 1/16th to 1/8th inch to where I then strictly
pull out (more effort than in past) successfully...
I assume its displayed on my P4P+ RC screen.
(FWIW, I fly up to take photos, then down & land, never
do any racing or pushing of drone's limits
Data point for those with pillowed batteries:
I put OP battery in -4F freezer a few hours;
it came out perfectly flat, no pillowing at all;
a couple days passed, no flying, some pillowing returned;
as I reported, up-down + pull motion at same time as
I press battery release buttons gets battery out
about 1/16th to 1/8th inch to where I then strictly
pull out (more effort than in past) successfully...