I bought a Nikon D5100. It doesn't work anymore. The I charged the battery, put it into the body, but it says the battery energy is low. The battery I'm using is from Nikon.
I'm thinking of buying a new battery. A battery from Nikon would cost me around 40€. A battery from 3rd party around 15€. But I've heard cameras with the latest firmware don't work at all with 3rd party batteries. How do I find the latest firmware version?