2021_0907_1536: sometimes, Things need to crave in to click on the right spot. my 600D ended up exchanged with the dealer a new set. And it comes with an working time/Date memory. no more time/date reset problem caused of built-in button cell :) Useless when it comes to needed, then i have to open the cast and customize it:)

2020_1020_1103: rdcollins912 and Bob Bell Glad that both of you give a hope to my search. I looked through the place around and beneath the battery lid by using the tweezers and just ended up doubt :( Would you please show me in PICTURES where is it located and how to open the button cell slot?