Battery module gap

[Quantumturbo]

I just got a g5 secondhand and there's a small gap between the battery module and phone body. Is this normal? Should I send it back or will the new one likely be the same?

 

[valvac2000]

it's normal. don't worry

 

[Tim1954]

I allows for slight expansion when the battery is hot..

 

[Quantumturbo]

I allows for slight expansion when the battery is hot..

I think that's doubtful. Just poor design. It's ok on one side and wider at the side with the catch.
Anyone else's like this? Just worried it's actually a bit broken on that side and the battery module will fall out if I'm not careful.