"They came with original kit."
OK, that is meaningless if you bought it from a off line retailer that was not a Canon USA dealer. "They came with original kit", what exactly does that mean? Did you get a bunch of stuff with it? They put all sorts of crap together to maximize their profit.
Perhaps it is a real deal Canon USA, if so it has failed. You need to buy a new battery first to see if that fixes your situation. Then a charger if the new battery doesn't help.
Ok I’ll try the new battery and/or charger thing. Thank you all for suggestions.
Btw, I purchased the camera and battery kit from Costco USA. I hope they should be genuine.
Not my first choice. I have found that electronic gear at those big box stores is frequently in an open box condition.
"I purchased the camera and battery kit from Costco USA"
Probably OK. It had a Canon USA warranty card included? That's all that is important as it proves it is a real deal Canon USA camera. Canon support number is 1 (800) 652-2666
Lithium Ion batteries are in many ways less "picky" than some other rechargeable battery technologies but they have a definite lifespan which can easily be shortened by improper usage and care. When storing for long periods of time you want the charge to be at around 50% and if unused for a long period of time the charge should be brought back up to the 50% range as continuing maintenance during long periods of storage. Consistently putting the battery into storage when charged to 70% or greater OR 30% or less will significantly reduce its usable lifespan.
Here is a good "plain English" guideline to Lithium Ion battery operation from leading test and measurements company Tektronix. If the link violates forum guidelines and is removed then do a google search for: Newark Tektronix lithium ion pdf and you will get the proper result.
.... leading test and measurements company Tektronix.
Tektronix. Now that name is a blast from the distant past. Ever use one of their space heaters?
Seriously, a couple of these old oscilloscopes could heat a room.
I own and use several different Tektronix scopes and my least "green" one is a Type 555 true dual beam scope with dual plug in vertical channels and dual plug in time bases. The power supply sits on the bottom of the scopemobile cart and both are loaded with vacuum tubes and cooled by separate very large fans. In operation the 555 draws close to one kilowatt. It is still in perfect working order and like other 500 series lab scopes it is reliable and easy to maintain although adjusting the lumped constant delay line is a tedious process.
My primary bench scope is a pair of somewhat newer Tektronix 7854 scopes although I do also have a smaller but less capable new Tektronix LCD screen scope that is convenient but there are times when I need the versatility of the multiple plug-ins which provide so much versatility with the older models.
Nobody wrote better technical manuals that the folks in Beaverton and Tektronix documentation puts most other manuals to shame in terms of content, organization, and overall clarity. The construction quality of the older scopes was also a thing of beauty with their ceramic strips with silver contact points and in the interior photo of the 555 you can see the roll of special silver bearing solder that Tektronix shipped inside of each of their instruments. It was truly a world class organization from design through manufacturing and customer followup.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
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