Today car can’t startup / checking and changing of battery (02-02-19)

Today car couldn’t startup so had someone from aa to check. So he first use the jump starter and then i went to the step on the engine and break to start the car. The car was able to start. After that had to off the car and use the battery tester meter and print out the health of the battery. Which shows the battery is in poor health and need to change. The battery is around 2 and 1/2 years which i suppose is about time.