Replaced twice on different cars with Bateriku.com
I give them 4.5 over 5.

The 1st time the service is very good as I was attended by their own staff.
The staff came at my office basement car park after office hour, did all the checks to make sure it was indeed the battery has gone flat or due to other factors. They were very polite, friendly and knowledgeable.

For the 2nd time, the service is still OK as I was served by one of their agent. The agent did the necessary job but he was kind in a hurry.