battery reads full on Cannon EOS RP but it's dead

[Cervan_a1]

I shoot with a cannon eos rp and have an off brand battery that I use. the camera says battery is full but then it dies right away. I'm trying to figure out if it's the battery or the camera that isn't working. 

[Tronhard]

The logical answers are:
1. Replace the off-brand battery (which is not supported) with a known good one, preferably the original Canon battery for your camera
2.  Use a multi-tester to confirm the battery has charge and how much that is.

[Cervan_a1]

Thank you! I will try that