i wonder if the battery been removed for a longer period of time, the car computer might needed to be reset. As today's cars all controlled by computers not like the old car mostly on mechanical. even the clock needed to be reset once battery is cut off..That's why i always bring my iQ back to the Toyota Dealer for any service work, changing a battery might looks like a simple job , but disconnecting a battery of a new model car might mess up all the computer settings and needed to be reprogramming. Dealers always got the right tool to do it but not always with the ordinary garage. It might cost you more but all parts are under warranty when you get it from the Dealer. Besides, all mechanics working at dealers have to go under training and upgrading knowledge on a specific car model. They will know your car better. ***or might be your new battery was not Fully charged up when being installed. Lots of time the garage did not fully charged up the battery because they have to work on another car in order to make more money, as long as your car can start up, they expect you to keep driving it for a while to recharge the battery..and or your alternator is not functioning well. If your car haven't giving you any trouble on starting (like starts at the first crank), don't have to listen to them saying that your battery is down to....Unless you noticed that you need to crank a lot of times or hearing the starter trying hard to turn over....then...even so, the battery might not be dead, it might be just the car has not been driven enough to recharge the battery itself. I had another car before (new) but it was sitting there not driven much, ending up the dealer checked and said that my battery level was down to...they gave me an option of driving more and hopefully the battery would come back, and i kept driving it more and the battery never gave me any problem, after 5 years, it was still good as new. my iQ was from 2014 but the battery still as good as new as well because two years ago, I started connecting a pig tail (that came with a trickle charger) out from the battery terminal, you can quick connecting the pig tail to the Battery Tender ($39.95 on sale at Canadian Tire Store-Canada), it would monitor your battery 24/7 and only trickle charge your battery when needed, maintaining the battery at 100% FULL at all time. Now my car always starts at the first crank. It was so good that I ended up bought another Battery Tender for other car.*** it was introduced to me by my neighbor who had a motor cycle, he had a car and only ride the bike once in a while, he had a Battery Tender on his battery, and plug into A/C once in a while to Trickle charge the battery, his battery now is 10 years old but still start at the first crank. My battery is going to be 7 years old in May, thanks to the Battery Tender, my battery is like new. ***you don't need to plug in the Battery Tender at all time, there are led lights, Red, flashing Green and steady Green. When steady green= battery 100% Full, you can unplug it. in my case, I might just plug it in once a week to treat my battery, and if I anticipate myself not going to drive my car for a while, I would plug it in and leave it.(you can leave it plug in as long as you want and would not hurt your battery because it would not charge the battery if it detected that the battery is full, only trickle charge when needed because all newer model cars got computer, clocks, alarms ...etc. that would drain battery even when not moving. ***connecting and disconnecting the battery Tender only takes 2 seconds (like charging your cellphone) Thanks for listening to my long story.