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Updated March 15, 2015.

Here is an early version of the implantable pulse generator neurostimulators. This one is a non-rechargable IPG, which means you would need to undergo a procedure every time the battery gives out in order to continue to get pain relief. Though you have to have the battery changed during a surgery, you gain the bonus of daily convenience; you will not need to remember to recharge your device every 24 hours, for example.

You can expect that the battery inside a device such as this one will last approximately 7 years.

The older the model, the larger it tends to be. The model shown here is about the size of a large stopwatch and weighs approximately 2.93 oz.