Answer:

POS

Answer	Crossword Clue
POS	Location, abbr.
POS	Not neg.
POS	Neg. opp.

POS	HMO alternative
POS	Neg.'s opposite
POS	Battery terminal abbr.
POS	Blood-type abbr.
POS	Batt. terminal
POS	+, on a batt.
POS	Stamp sellers, briefly
POS	Terminal abbr.

POS	Bldgs. with boxes
POS	Like nos. above zero
POS	+, on an AA batt.
POS	Bldgs. for mailers
POS	Ltr. distributors
POS	Opposite of neg.
POS	Battery terminal (abbr.)
POS	Places to pick up pkgs.

POS	+ (abbr.)
POS	Red, on a set of jumper cables (abbr.)
POS	Stamp sellers, for short
POS	Like a double neg.
POS	Certain: Abbr.
POS	Negative's opp.
POS	Battery abbr.
POS	ABO designation

POS	Letters on a car battery
POS	Neg.'s opp.
POS	Like some chgs.
POS	Situation: Abbr.
POS	Battery terminal: Abbr.
POS	Opp. of neg.
POS	Letter getters: Abbr.
POS	+, for short

POS	Mailing ctrs.
POS	Mail ctrs.
POS	Weigh stations: Abbr.
POS	Letter takers, for short
POS	Drop-off points: Abbr.