Best for high-drain applications (eg power tools/Children's toys/Flash/Microphone/Measuring instruments). 

Advantages: 

1. Nickel–zinc batteries perform well in high-drain applications, and may have the potential to replace lead–acid batteries because of their higher energy-to-mass ratio and higher power-to-mass ratio — as little as 25% of the mass for the same power.
2. The European Parliament has supported bans on cadmium-based batteries. Nickel–zinc is a good alternative for power tools and other applications.  
3. NiZn is a good battery choice for applications requiring high-power and high-voltage.
4. Nickel–zinc cells have an open circuit voltage of 1.85 volts when fully charged and a nominal voltage of 1.65 V. This makes NiZn an excellent replacement for electronic products designed to use 1.5 V alkaline primary cells.
5. NiZn batteries do not use mercury, lead, or cadmium, or metal hydrides, all of which can be difficult to recycle. Both nickel and zinc are commonly occurring elements in nature, and can be fully recycled.
6. NiZn cells use no flammable active materials or organic electrolytes.
7. Properly designed NiZn cells can have very high power density and low-temperature discharging performance, and also can be discharged to almost 100%, and recharged without problems.
8. Zinc is a cheap and abundant metal, the 24th most abundant element in the Earth's crust, and is not dangerous to health. Common oxidation is +2, so charge and discharge move two electrons instead of one as in NiMH batteries.