iPhone 5 fixed, but battery loose

My friend that I repaired her iphone for has a problem which is rather annoying.

Every 1-3 days her battery is disconnected from the board.

Reason for this is that the company she brought her phone to before has removed these plates:

1: https://d3nevzfk7ii3be.cloudfront.net/ig...

2: https://d3nevzfk7ii3be.cloudfront.net/ig...

(both)

and never placed them back. also the battery seems to have quite some space between the sides and I have no idea on how to solve this issue. are these parts also in the shop? or anything that can hold the battery in place?