Nickel–cadmium battery - Wikipedia
Capacity fade characteristics of nickel-based lithium-ion secondary battery after calendar deterioration at 80 °C - ScienceDirect
Nickel metal hydride battery typical discharge curve. The NiMH battery
How to Choose Batteries
Ni-MH Battery, Industrial
Discharge curves of NiMH cells at different temperatures.
Nickel–metal hydride battery - Wikipedia
Different Types of Batteries and Their Uses & Applications
Batteries — choose the right power source for your robot, by Radek Jarema, Husarion Blog