1. They're not as efficient as lithium-ion batteries.
Nickel-based batteries are not as efficient as lithium-ion batteries. This means that they don't hold as much charge and can't be used for as long as lithium-ion batteries.
2. They're more expensive.
Nickel-based batteries are more expensive than lithium-ion batteries. This is because they're not as mass-produced and don't have the same economies of scale.
3. They're more harmful to the environment.
Nickel-based batteries are more harmful to the environment than lithium-ion batteries. This is because they contain heavy metals like lead and cadmium, which can leach into the ground and water.
4. They're less safe.
Nickel-based batteries are less safe than lithium-ion batteries. This is because they're more likely to leak and catch fire.
So, are nickel-based batteries on the way out? It looks like it. If you're looking for a more efficient, cheaper, and safer option, lithium-ion batteries are the way to go.