Wind up torches use a handle to spin an internal dynamo. The dynamo charges up an internal battery built into the torch.
The internal battery is usually Lithium Ion (Li-ion) like those found in mobile phones or Nickel Metal Hydride (Ni-MH) like those found in garden solar lights, these are wired in to the operating circuit so they can not be replaced.
All batteries have certain life span determined by the number of times they have been recharged, these type will last for about 1000 cycles. This means that a torch battery will last about about 3 to 5 years of daily usage.
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