Final answer:
A single-bottle portable coolant recharge unit is a portable device used to fill one bottle of coolant at a time.
Step-by-step explanation:
The portable coolant recharge unit that is capable of filling one bottle at a time is called a single-bottle portable coolant recharge unit.
This device is commonly used in automotive repair shops and garages to replenish the coolant in a vehicle's cooling system.
It is designed to be easily transported and operated.