Showing results for 
Show  only  | Search instead for 
Did you mean: 

Canon 600 RT 2 not reading Batteries


this has been discussed numerous times in this forum.  The flash will not recognize the batteries and displays a blank battery symbol with a line through it.  Some of the fixes have been centered around the adapter for the filter causing an issue.  i never use it or have it on the flash.  Other fixes suggested are opening and closing the battery door with the unit on, holding the reset buttons, etc.  It seems all of these fixes work for some and nothing for others.  I had issues with this on a big important shoot with a second shooter and we had to improvise to use my Fashpoint Explorer 300 only, on a light stand.  In my humble opinion this is inexcusable!  For the cost of these flashes this should not be happening, or Canon should fix or reimburse anyone having this problem.  I have inquired with a lawyer re: a class action suit, since Canon seems to plead ignorance to the problem.  When you invest in equipment that is not cheap, it should perform as expected and one should not have to fiddle around with battery doors, or filter holders, etc.  I bought it to shoot when i need it, not to fumble with.  If there is an issue it should have been resolved by Canon long ago.

My immediate fix is to use another brand.  The flashpoint r2 recycles faster, is a 3rd the price, doesnt use AA's, and doesnt have any glitches to figure out or play with.

08/18/2023: Canon EOS R5 C training series is released.

07/31/2023: New firmware updates are available.

CR-N700 - Version 1.2.0

CR-N500 - Version 1.3.0

CR-N300 - Version 1.3.0

CR-X300 - Version 1.1.0

06/30/2023: New firmware version is available for EOS-R5 C

05/31/2023: New firmware updates are available.

EOS R6 Mark II - Version 1.1.2

EOS R6 - Version 1.8.2

EOS R7 - Version 1.3.1

05/18/2023: New firmware updates are available.

EOS Rebel T100 - Version 1.1.0

EOS Rebel T7 - Version 1.2.0

EOS 5D Mark IV - Version 1.4.0

EOS 6D Mark II - Version 1.2.0

PowerShot Elph 360HS - Version

PowerShot SX420 IS - Version

PowerShot 620 HS - Version

PowerShot SX720 HS - Version

PowerShot G1X Mark III - Version

PowerShot G7X Mark II - Version

PowerShot G9X Mark II - Version


04/20/2023: New firmware version 1.4.1 is available for EOS R3

03/30/2023: New firmware updates are available.

EOS R5 - Version 1.8.1

EOS 1DX Mark III- Version 1.7.1

Speedlite EL-1 - Version 1.0.2

03/30/2023: Product Advisory for EF50 F1.2 L USM

03/30/2023: Product Advisory for EOS R10

02/24/2023: We've updated Share Your Photos

2/07/2023: New product announcements!

EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM
01/09/2023: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
01/03/2023: Welcome to CES 2023!
12/08/2022: New firmware version is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5