why do “normal” batteries still exist when there are chargeable batteries?
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Non-rechargeable batteries are very cheap compared to rechargeable batteries. There are lots of applications where batteries can last for a year or more like a TV remote. It would be hard to break even the extra cost because chargeable batteries age too.
So if batteries in a device last for a very long time Non-rechargeable batteries are often the better choice.
If batteries do not last for a long time rechargeable batteries have a clear advantage. They quickly have a cost advantage and recharging is often quite simple. In applications like that rechargeable batteries are typically used today.
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