Nickel-hydrogen battery slowly replaced nickel-chromium batteries

How is the nickel-hydrogen battery slowly replaced nickel-chromium batteries, a good replacement, that is, what is the advantage of the advantage of the nickel-chromium battery, the advantage is that the high power discharge is stable, the price is relatively cheap, what is the shortcoming to face elimination, That is to pollute the environment, harmful to the human body, and have a memory effect, which is 60% of long-term charging, and the battery will recognize the maximum capacity of the battery as the original 60%. What is the advantage of nickel-hydrogen batteries? High capacity, good high and low temperature, no memory effect, high power discharge, no pollution safety, etc. The only shortcoming of nickel-hydrogen batteries may be more expensive.
The nickel-hydrogen battery and the nickel-cadmium battery are similar, and the positive electrode and nickel-cadmium battery of the nickel-hydrogen battery are substantially the same, and the nickel hydroxide is a positive electrode, and the main difference is that the nickel-cadmium battery negative electrode plate is a cadmium active substance. The nickel-hydrogen battery is an negative electrode with a high energy hydrogen storage alloy, so the nickel-hydrogen battery has a larger energy. At the same time, the nickel-hydrogen battery is basically similar to the nickel-cadmium battery in terms of electrochemical properties, so the nickel-hydrogen battery can be completely replaced by nickel-cadmium batteries during use without any modification of the equipment.