We are all probably aware of at least one of the below emergency battery replacement providers:

Carput
Baterihub
Bateriku
Battery Express

Are all equally good? Or are some/one of them to be avoided?

Best way to find out is to read reviews on the appstore page

ah. you are absolutely correct. brain probably not working well this Friday night

but nevermind lets see what the forumers have to share

Bateriku recently pushing for a new unknown brand Astra, they claim to be better specced vs price.

I end up using Bateriboy with Century Marathoner.